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a(n) = number of distinct quadruples of squares modulo n.
0

%I #31 Jan 14 2024 11:52:37

%S 1,16,16,16,81,256,256,81,256,1296,1296,256,2401,4096,1296,256,6561,

%T 4096,10000,1296,4096,20736,20736,1296,14641,38416,14641,4096,50625,

%U 20736,65536,2401,20736,104976,20736,4096,130321,160000,38416,6561,194481,65536

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

%F a(n) = A000224(n)^4. - _Andrew Howroyd_, Aug 06 2018

%Y Cf. A000224, A068197.

%K nonn,mult

%O 1,2

%A _José María Grau Ribas_, Jun 16 2013

%E Name corrected by _Andrew Howroyd_, Aug 06 2018