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A012132 Numbers z such x(x+1)+y(y+1)=z(z+1) is solvable. +0
5
3, 6, 8, 10, 11, 13, 15, 16, 18, 20, 21, 23, 26, 27, 28, 31, 33, 36, 37, 38, 40, 41, 43, 44, 45, 46, 48, 49, 51, 52, 53, 54, 55, 56, 57, 58, 59, 61, 62, 63, 64, 66, 67, 68, 71, 73, 74, 75, 76, 77, 78, 80, 81, 83, 86, 88, 89, 91, 92, 93 (list; graph; listen)
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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.


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