euler.jl

## Project Euler
#
#  problems: http://projecteuler.net/problems
#  solutions: https://code.google.com/p/projecteuler-solutions/wiki/ProjectEulerSolutions

#1: 233168
@test sum(filter(n->(n%3==0)|(n%5==0),1:999)) == 233168

#2: 4613732
function euler2(n)
	t, i, j = 0, 1, 2
	while j <= n
		  t += j
		  i, j = j, i+j
		  i, j = j, i+j
		  i, j = j, i+j
	end
	return t
end
@test euler2(4000000) == 4613732

#3: 6857
@test maximum(keys(factor(600851475143))) == 6857

#4: 906609
function euler4(n)
	m = 1
	for a=10^n-1:-1:10^(n-1),
		b=10^n-1:-1:max(a,-fld(-m,a))
		p = a*b
		d = digits(p)
		d == reverse(d) || continue
		m = max(m,p)
	end
	return m
end
@test euler4(3) == 906609

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#16: 1366
@test sum(digits(big(2)^1000)) == 1366

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