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• As of 1st July 2021

Top 5, India

29th, World

Problem	Solution	Language	Result	Comments
#1	Multiples of 3 and 5	java	100.00
#2	Even Fibonacci numbers	java	100.00
#3	Largest prime factor	java	100.00
#4	Largest palindrome product	java	100.00
#5	Smallest multiple	java	100.00
#6	Sum square difference	java	100.00
#7	10001st prime	java	100.00
#8	Largest product in a series	java	100.00
#9	Special Pythagorean triplet	java	100.00
#10	Summation of primes	java	100.00
#11	Largest product in a grid	java	100.00
#12	Highly divisible triangular number	java	100.00
#13	Large sum	java	100.00
#14	Longest Collatz sequence	java	100.00
#15	Lattice paths	java	100.00
#16	Power digit sum	java	100.00
#17	Number to Words	c	100.00
#18	Maximum path sum I	c++	100.00
#19	Counting Sundays	java	100.00
#20	Factorial digit sum	java	100.00
#21	Amicable numbers	java	100.00
#22	Names scores	java	100.00
#23	Non-abundant sums	java	100.00
#24	Lexicographic permutations	java	100.00
#25	N-digit Fibonacci number	java	100.00
#26	Reciprocal cycles	python	100.00
#27	Quadratic primes	java	100.00
#28	Number spiral diagonals	java	100.00
#29	Distinct powers	java	100.00
#30	Digit Nth powers	java	100.00
#31	Coin sums	java	100.00
#32	Pandigital products	java	100.00
#33	Digit canceling fractions	java	100.00
#34	Digit factorials	java	100.00
#35	Circular primes	java	100.00
#36	Double-base palindromes	java	100.00
#37	Truncatable primes	java	100.00
#38	Pandigital multiples	java	100.00
#39	Integer right triangles	c++	100.00
#40	Champernowne's constant	c++	100.00
#41	Pandigital prime	java	100.00
#42	Coded triangle numbers	java	100.00
#43	Sub-string divisibility	c++	100.00
#44	Pentagon numbers	java	100.00
#45	Triangular, pentagonal, and hexagonal	java	100.00
#46	Goldbach's other conjecture	java	100.00
#47	Distinct primes factors	java	100.00
#48	Self powers	java	100.00
#49	Prime permutations	c++	100.00
#50	Consecutive prime sum	c++	100.00
#51	Prime digit replacements	c++	100.00
#52	Permuted multiples	c++	100.00
#53	Combinatoric selections	c++	100.00
#54	Poker hands	c++	100.00
#55	Lychrel numbers	c++	100.00
#56	Powerful digit sum	python	100.00
#57	Square root convergents	python	100.00
#58	Spiral primes	c++	100.00
#59	XOR decryption	python	100.00
#60	Prime pair sets	c++	100.00
#61	Cyclical figurate numbers	c++	100.00
#62	Cubic permutations	c++	100.00
#63	Powerful digit counts	c++	100.00
#64	Odd period square roots	java	100.00
#65	Convergents of e	c++	100.00
#66	Diophantine equation	c++	100.00
#67	Maximum path sum II	c++	100.00
#68	Magic N-gon ring	c++	100.00
#69	Totient maximum	c++	100.00
#70	Totient permutation	c++	100.00
#71	Ordered fractions	java	100.00
#72	Counting fractions	java	100.00
#73	Counting fractions in a range	java	100.00
#74	Digit factorial chains	c++	100.00
#75	Singular integer right triangles	c++	100.00
#76	Counting summations	c++	100.00
#77	Prime summations	c++	100.00
#78	Coin partitions	c++	100.00
#79	Passcode derivation	c++	100.00
#80	Square root digital expansion	python	100.00
#81	Path sum: two ways	c++	100.00
#82	Path sum: three ways	c++	100.00
#83	Path sum: four ways	c++	100.00
P#84	Monopoly odds	c++	10.00	Wrong Answer
#85	Counting rectangles	c++	100.00
#86	Cuboid route	java	100.00
#87	Prime power triples	c++	100.00
#88	Product-sum numbers	c++	100.00
#89	Roman numerals	python	100.00
P#90	Cube digit pairs	c++	67.50	Terminated due to timeout
#91	Right triangles with integer coordinates	c++	100.00
#92	Square digit chains	c++	100.00
#93	Arithmetic expressions	java	100.00
#94	Almost equilateral triangles	java	100.00
#95	Amicable chains	java	100.00
#96	Su Doku	java	100.00
#97	Large non-Mersenne prime	c++	100.00
#98	Anagramic squares	c++	100.00
#99	Largest exponential	java	100.00
P#100	Arranged probability	c++	22.22	Wrong Answer
P#101	Optimum polynomial			Unsolved
#102	Triangle containment	c++	100.00
#103	Special subset sums: optimum	c++	100.00
#104	Pandigital Fibonacci ends	c++	100.00
#105	Special subset sums: testing	c++	100.00
P#106	Special subset sums: meta-testing			Unsolved
#107	Minimal network	c++	100.00
P#108	Diophantine reciprocals I	c++	36.36	Terminated due to timeout
P#109	Darts			Unsolved
P#110	Diophantine reciprocals II	c++	50.0	Wrong Answer
#111	Primes with runs	python	100.00
P#112	Bouncy numbers			Unsolved
#113	Non-bouncy numbers	c++	100.00
#114	Counting block combinations I	c++	100.00
P#115	Counting block combinations II			Unsolved
#116	Red, green or blue tiles	c++	100.00
#117	Red, green, and blue tiles	c++	100.00
#118	Pandigital prime sets	c++	100.00
#119	Digit power sum	c++	100.00
P#120	Square remainders	c++	26.67	Wrong Answer
#121	Disc game prize fund	python	100.00
#122	Efficient exponentiation	c++	100.00
P#123	Prime square remainders			Unsolved
P#124	Ordered radicals	c++	30.0	Terminated due to timeout
#125	Palindromic sums	java	100.00
P#126	Cuboid layers			Unsolved
P#127	abc-hits			Unsolved
#128	Hexagonal tile differences	c++	100.00
P#129	Repunit divisibility			Unsolved
P#130	Composites with prime repunit property	c++	52.00	Terminated due to timeout
P#131	Prime cube partnership	c++	50.00	Wrong Answer
P#132	Large repunit factors			Unsolved
P#133	Repunit nonfactors	c++	80.00	Terminated due to timeout
P#134	Prime pair connection			Unsolved
#135	Same differences	c++	100.00
P#136	Singleton difference			Unsolved
P#137	Fibonacci golden nuggets	c++	33.33	Terminated due to timeout
P#138	Special isosceles triangles			Unsolved
P#139	Pythagorean tiles			Unsolved
P#140	Modified Fibonacci golden nuggets			Unsolved
P#141	Investigating progressive numbers, n, which are also square.			Unsolved
P#142	Perfect Square Collection			Unsolved
P#143	Investigating the Torricelli point of a triangle			Unsolved
P#144	Investigating multiple reflections of a laser beam.			Unsolved
P#145	How many reversible numbers are there below one-billion?			Unsolved
P#146	Investigating a Prime Pattern	c++	56.00	Wrong Answer
P#147	Rectangles in cross-hatched grids	c++	25.00	Terminated due to timeout
P#148	Exploring Pascal's triangle.			Unsolved
P#149	Searching for a maximum-sum subsequence.			Unsolved
P#150	Searching a triangular array for a sub-triangle having minimum-sum.	c++	100.00
P#151	Paper sheets of standard sizes: an expected-value problem.			Unsolved
P#152	Writing 1/2 as a sum of inverse squares	c++	30.00	Wrong Answer
P#153	Investigating Gaussian Integers			Unsolved
P#154	Exploring Pascal's pyramid.	c++	45.00	Terminated due to timeout
P#155	Counting Capacitor Circuits.	c++	94.12	Terminated due to timeout
#156	Counting Digits	c++	100.00
P#157	Solving the diophantine equation 1/a +1/b = p/10^n			Unsolved
P#158	Exploring strings			Unsolved
#159	Digital root sums of factorisations.	c++	100.00
P#160	Factorial trailing digits			Unsolved
#161	Triominoes	c++	100.00
#162	Hexadecimal numbers	c++	100.00
#163	Cross-hatched triangles	c++	100.00
#164	Numbers for which no three consecutive digits have a sum greater than a given value.	c++	100.00
#165	Intersections	c++	100.00
#166	Criss Cross	c++	100.00
P#167	Investigating Ulam sequences	c	30.00	Segmentation Fault
#168	Number Rotations	c++	100.00
#169	Exploring the number of different ways a number can be expressed as a sum of powers of 2.	c++	100.00
P#170	Find the largest 0 to 9 pandigital that can be formed by concatenating products.	c++	5.00	Wrong Answer
P#171	Finding numbers for which the sum of the squares of the digits is a square	c++	5.26	Wrong Answer
P#172	Investigating numbers with few repeated digits			Unsolved
#173	Using up to one million tiles how many different "hollow" square laminae can be formed?	c++	100.00
P#174	Counting the number of "hollow" square laminae that can form one, two, three, ... distinct arrangements.			Unsolved
P#175	Fractions involving the number of different ways a number can be expressed as a sum of powers of 2.			Unsolved
P#176	Rectangular triangles that share a cathetus.			Unsolved
P#177	Integer angled Quadrilaterals.			Unsolved
P#178	Step Numbers			Unsolved
P#179	Consecutive positive divisors			Unsolved
P#180	Rational zeros of a function of three variables.			Unsolved
P#181	Investigating in how many ways objects of two different colours can be grouped.			Unsolved
P#182	RSA encryption			Unsolved
#183	Maximum product of parts	c++	100.00
P#184	Triangles containing the origin.			Unsolved
#185	Number Mind	python	100.00
#186	Connectedness of a network.	c++	100.00
#187	Semiprimes	c++	100.00
P#188	The hyperexponentiation of a number			Unsolved
P#189	Tri-colouring a triangular grid			Unsolved
P#190	Maximising a weighted product			Unsolved
P#191	Prize Strings			Unsolved
P#192	Best Approximations			Unsolved
P#193	Squarefree Numbers	java	6.67	Unsolved
P#194	Coloured Configurations			Unsolved
P#195	Inscribed circles of triangles with one angle of 60 degrees			Unsolved
P#196	Prime triplets	c++	94.74	Segmentation Fault
#197	Investigating the behaviour of a recursively defined sequence	python	100.00
P#198	Ambiguous Numbers			Unsolved
P#199	Iterative Circle Packing			Unsolved
#200	Find the 200th prime-proof sqube containing the contiguous sub-string "200"	c++	100.00
#201	Subsets with a unique sum	c++	100.00
P#202	Laserbeam			Unsolved
P#203	Squarefree Binomial Coefficients			Unsolved
P#204	Generalised Hamming Numbers			Unsolved
P#205	Dice Game			Unsolved
P#206	Concealed Square	python	15.40	Terminated due to timeout
#207	Integer partition equations	python	100.00
P#208	Robot Walks			Unsolved
P#209	Circular Logic			Unsolved
P#210	Obtuse Angled Triangles			Unsolved
#211	Divisor Square Sum	c++	100.00
P#212	Combined Volume of Cuboids			Unsolved
P#213	Flea Circus			Unsolved
P#214	Totient Chains			Unsolved
P#215	Crack-free Walls			Unsolved
P#216	Investigating the primality of numbers of the form 2n² - 1			Unsolved
P#217	Balanced Numbers	python	0.10	Terminated due to timeout
#218	Perfect right-angled triangles	c++	100.00
P#219	Skew-cost coding			Unsolved
P#220	Heighway Dragon			Unsolved
P#221	Alexandrian Integers			Unsolved
P#222	Sphere Packing			Unsolved
P#223	Almost right-angled triangles I	java	10.00	Terminated due to timeout
P#224	Almost right-angled triangles II			Unsolved
P#225	Tribonacci non-divisors	c	60.00	Terminated due to timeout
P#226	A Scoop of Blancmange			Unsolved
P#227	The Chase			Unsolved
P#228	Minkowski Sums			Unsolved
P#229	Four Representations using Squares	java	6.67	Terminated due to timeout
#230	Fibonacci Words	python	100.00
P#231	The prime factorisation of binomial coefficients			Unsolved
P#232	The Race			Unsolved
P#233	Lattice points on a circle			Unsolved
P#234	Semidivisible numbers	c#	8.22	Terminated due to timeout
P#235	An Arithmetic Geometric sequence	java	75.00	Wrong Answer
P#236	Luxury Hampers	python	33.33	Terminated due to timeout
P#237	Tours on a 4 x n playing board			Unsolved
P#238	Infinite string tour			Unsolved
P#239	Twenty-two Foolish Primes			Unsolved
P#240	Top Dice	c++	2.00	Terminated due to timeout
P#241	Perfection Quotients	python	28.00	Terminated due to timeout
P#242	Odd Triplets			Unsolved
P#243	Resilience			Unsolved
P#244	Sliders	python	77.78	Terminated due to timeout
P#245	Coresilience			Unsolved
P#246	Tangents to an ellipse			Unsolved
P#247	Squares under a hyperbola			Unsolved
P#248	Numbers for which Euler’s totient function equals 13!			Unsolved
P#249	Prime Subset Sums			Unsolved
P#250	250250	python	40.74	Terminated due to timeout
P#251	Cardano Triplets	c++	5.44	Terminated due to timeout
P#252	Convex Holes			Unsolved
P#253	Tidying up			Unsolved
P#254	Sums of Digit Factorials			Unsolved

I have utilized various sources to assist with some of the questions. My sincere thanks to everyone who contributed. I would also like to give full credit to the original creators. If you believe that any part of the work closely resembles yours, please feel free to let me know. I will be happy to acknowledge your contribution with the utmost respect and gratitude.

Credits:

• My own work
• [nayuki/Project-Euler-solutions] (https://github.com/nayuki/Project-Euler-solutions)
• [stbrumme/euler] (https://github.com/stbrumme/euler)