jasen Posted July 24, 2016 Report Share Posted July 24, 2016 0 and 1 are a triangle number, a square number, and also a pentagonal number what is the next number (after 1) which is a triangle number, a square number, and also a pentagonal number ? clue : Surprisingly The number is more than 30 digit number. Quote Link to comment Share on other sites More sharing options...

0 jasen Posted July 24, 2016 Author Report Share Posted July 24, 2016 Sorry, I think I made mistake, my computer search give me wrong number due to limitation of floating point number. So I still don't have the answer yet. But checking internet source, it is believed there is no such number. http://mathworld.wolfram.com/PentagonalSquareTriangularNumber.html Quote Link to comment Share on other sites More sharing options...

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## jasen

0 and 1 are a triangle number, a square number, and also a pentagonal number

what is the next number (after 1) which is a triangle number, a square number, and also a pentagonal number ?

clue :

Surprisingly The number is more than 30 digit number.

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