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%I #8 Sep 21 2019 08:27:12
%S 1,4,6,16,18,576,78,1728,1365,5184,486,2985984,3474,389376,13583700,
%T 268435456,65538,119246400,45006,39261044736,21400013700,15116544,
%U 67590,45476068117708800,8696104065,772395264,19496328075,1822309056774144,231340050
%N Number of functions f:[n]->[n] such that f[(x^2) mod n]=[f(x)^2] mod n for all x in [n], for n=1,2,3,... Here [n] denotes {0,1,2,...,n-1}.
%C See A117986 and A117987 for results on other modular functional equations.
%H Rémy Sigrist, <a href="/A117988/b117988.txt">Table of n, a(n) for n = 1..767</a>
%H Rémy Sigrist, <a href="/A117988/a117988.gp.txt">PARI program for A117988</a>
%o (PARI) See Links section.
%Y Cf. A023153, A117986, A119787.
%K nonn
%O 1,2
%A _John W. Layman_, Apr 14 2006
%E More terms from _Rémy Sigrist_, Sep 20 2019
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