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A226954
Numbers n such that there are seven distinct triples (k, k+n, k+2n) of squares.
1
12671122464000, 50684489856000, 114040102176000, 202737959424000, 316778061600000, 456160408704000, 620885000736000, 810951837696000, 1026360919584000, 1267112246400000, 1533205818144000
OFFSET
1,1
COMMENTS
For the first 11 terms we have a(n) = n^2 * a(1). Are there any other primitive terms other than a(1)?
EXAMPLE
These 7 triples of squares have a common difference of 12671122464000: (676403^2, 3623347^2, 5079347^2), (911820^2, 3674580^2, 5116020^2), (2615340^2, 4417140^2, 5672940^2), (4885860^2, 6045060^2, 7015260^2), (5664815^2, 6690385^2, 7578415^2), (10873380^2, 11441220^2, 11982180^2) and (11985330^2, 12502770^2, 12999630^2).
CROSSREFS
KEYWORD
nonn
AUTHOR
Zdenek Cervenka, Jun 26 2013
STATUS
approved