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A117988 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}. 2
1, 4, 6, 16, 18, 576, 78, 1728 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

See A117986 and A117987 for results on other modular functional equations.

LINKS

Table of n, a(n) for n=1..8.

CROSSREFS

Cf. A117986, A119787.

Sequence in context: A186201 A138624 A071428 * A263636 A238411 A120542

Adjacent sequences:  A117985 A117986 A117987 * A117989 A117990 A117991

KEYWORD

nonn,more

AUTHOR

John W. Layman, Apr 14 2006

STATUS

approved

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Last modified March 30 16:34 EDT 2017. Contains 284302 sequences.