A226757 a(n) = number of distinct quadruples of squares modulo n.

1, 16, 16, 16, 81, 256, 256, 81, 256, 1296, 1296, 256, 2401, 4096, 1296, 256, 6561, 4096, 10000, 1296, 4096, 20736, 20736, 1296, 14641, 38416, 14641, 4096, 50625, 20736, 65536, 2401, 20736, 104976, 20736, 4096, 130321, 160000, 38416, 6561, 194481, 65536

Offset: 1

Author

José María Grau Ribas, Jun 16 2013

Keywords

• nonn
• mult

Crossrefs

Cf. A000224, A068197.

Formula

a(n) = A000224(n)^4. - Andrew Howroyd, Aug 06 2018

Extensions

Name corrected by Andrew Howroyd, Aug 06 2018