A009661 Smallest number m such that m^m+1 is divisible by n.

0, 0, 5, 3, 2, 5, 3, 7, 17, 9, 21, 11, 6, 3, 29, 15, 24, 17, 27, 19, 41, 21, 11, 23, 18, 25, 53, 3, 14, 29, 15, 31, 35, 33, 69, 35, 6, 27, 77, 39, 25, 41, 63, 35, 89, 11, 23, 47, 97, 49, 101, 51, 26, 53, 109, 55, 113, 35, 117, 59, 30, 15, 125, 63, 18, 35, 99, 67, 11, 69, 35, 71, 9, 27

Offset

1,3

Comments

If n is odd, then a(n) <= 2*n - 1. If n is even, then a(n) <= n - 1. - Thomas Ordowski, Dec 03 2023

Links

Table of n, a(n) for n=1..74.

Prog

(PARI) a(n) = my(m=0); while ((1+Mod(m, n)^m) != 0, m++); m; \\ Michel Marcus, Dec 03 2023

Crossrefs

Cf. A014566, A133090, A268466.

Sequence in context: A294568 A290349 A373666 * A023576 A271523 A352903

Adjacent sequences: A009658 A009659 A009660 * A009662 A009663 A009664

Keyword

nonn

Author

David W. Wilson

Status

approved