Branch and bound solution for the problem João Brandão numbers
Sequences of size 27 for n = 100 are found under 1 hour. Example of a sequence of size 30 for n = 114: 1 2 4 9 12 13 18 19 28 30 31 33 40 45 46 69 70 75 82 84 85 87 96 97 102 103 106 111 113 114