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}.
1, 4, 6, 16, 18, 576, 78, 172
2 seqfan posts
Tue Jun 9 09:48:51 CEST 2009 [seqfan] Re: functions f:[n]->[n] such that f[(2*x) mod n]=[2*f(x)]