A226757 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A226757

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

0

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..42.

FORMULA

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

CROSSREFS

Cf. A000224, A068197.

Sequence in context: A192632 A305945 A010855 * A248764 A238409 A040241

Adjacent sequences: A226754 A226755 A226756 * A226758 A226759 A226760

KEYWORD

nonn,mult

AUTHOR

José María Grau Ribas, Jun 16 2013

EXTENSIONS

Name corrected by Andrew Howroyd, Aug 06 2018

STATUS

approved