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Project Euler Problem 45
Triangle, pentagonal, and hexagonal numbers are generated by the
following formulae:
Triangle Tn=n(n+1)/2 1, 3, 6, 10, 15, ... Pentagonal
Pn=n(3n−1)/2 1, 5, 12, 22, 35, ... Hexagonal Hn=n(2n−1) 1, 6,
15, 28, 45, ... It can be ver...