solutions to project euler problems at http://projecteuler.net
1:233168 2:4613732 3:6857 4:906609 5:232792560 6:25164150 7:104743 8:40824 9:31875000 10:142913828922 11:70600674 12:76576500 13:5537376230 14:837799 15:137846528820 16:1366 17:21124 18:1074 19:171 20:648 67:7273