

A256000


Numbers whose square can be written as sum of at least 3 consecutive triangular numbers in two ways.


0



286, 826, 2739, 3971, 5698, 9196, 10166, 10697, 22990, 61006, 132795, 416790, 766480, 809380, 2396870, 2904434, 3459006, 3688802, 4518514, 11725659, 13111098, 13998608, 15709122, 22173027, 22365267, 23636272, 23823988, 32186742, 33630662, 33658710, 39502086, 46387924, 59101625, 62381858, 89841192
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OFFSET

1,1


COMMENTS

Apparently there is an infinity of such numbers and there are no cases of 3 ways.


LINKS



EXAMPLE

4518514^2 = T(18801)+..+T(50546) = T(52361)+..+T(64316), where T(n) = A000217(n).


CROSSREFS



KEYWORD

nonn


AUTHOR



EXTENSIONS



STATUS

approved



