A063663 Numbers which can be written as b^2*c^2*(b^2+c^2).

0, 2, 20, 90, 128, 272, 468, 650, 1280, 1332, 1458, 2450, 2900, 3600, 4160, 5760, 6642, 7650, 8192, 10100, 10388, 14580, 14762, 16400, 17408, 20880, 25578, 27540, 28730, 29952, 31250, 38612, 41600, 42048, 50850, 50960, 54900, 60500, 65610

Offset

1,2

Links

David A. Corneth, Table of n, a(n) for n = 1..10000

Example

468 is in the sequence since 2^2*3^2*(2^2+3^2) = 4*9*13 = 468.

Prog

(PARI) upto(n) = { my(res = List(0)); for(i = 1, sqrtint(n), for(j = 1, i, c = i^2 * j^2 * (i^2 + j^2); if(c <= n, listput(res, c); , next(2) ) ) ); Set(res) } \\ David A. Corneth, Nov 01 2020

Crossrefs

Cf. A063664.

Sequence in context: A331760 A098077 A279264 * A071253 A069187 A328510

Adjacent sequences: A063660 A063661 A063662 * A063664 A063665 A063666

Keyword

nonn

Author

Henry Bottomley, Jul 25 2001

Extensions

Offset 1 from Michel Marcus, Nov 01 2020

Status

approved