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PUZZLET 196

A Palindrome from Triangular Numbers


Triangular numbers are formed from triangular collections of like objects.  Start with 1, add 2 to it, then 3 to the sum, then 4 to that sum . . . giving the sequence 1, 3, 6, 10, 15, 21, 28 ...

Add together any three successive triangular numbers to make a palindrome, value not to exceed 1 billion.

tri_nums


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Last Updated: January 17th, 2010.