A065337 a(n) is the smallest number not already used such that Sum_{m = 0 .. n-1} a(m)*a(m+1) is a square.

1, 4, 3, 11, 16, 19, 33, 21, 31, 96, 13, 65, 63, 55, 145, 336, 40, 240, 53, 429, 272, 376, 130, 380, 108, 78, 1368, 49, 235, 288, 196, 627, 59, 1360, 52, 738, 192, 312, 75, 157, 2432, 81, 313, 3040, 209, 603, 1120, 45, 281, 4448, 2847, 357, 1265, 784, 1153, 9495

Offset

0,2

Links

Table of n, a(n) for n=0..55.

Example

a(4) = 5 because a(0)*a(1)+a(1)*a(2)+a(2)*a(3)+a(3)*a(4) = 1*4+4*3+3*11+11*16 = 225

Crossrefs

A065336

Sequence in context: A200073 A080777 A001166 * A257078 A072802 A093726

Adjacent sequences: A065334 A065335 A065336 * A065338 A065339 A065340

Keyword

nonn

Author

Jonathan Ayres (jonathan.ayres(AT)btinternet.com), Oct 29 2001

Status

approved