A049048 Composite numbers n such that k! == 1 (mod n) for some k > 2.

119, 121, 221, 299, 391, 527, 901, 961, 1387, 1643, 1829, 2047, 2627, 3569, 5083, 9641, 9869, 10379, 11449, 16337, 16517, 18349, 22577, 23267, 23999, 25199, 27931, 28471, 31877, 32989, 33431, 37127, 40319, 47029, 48827, 50933, 52777, 55277

Offset

1,1

Comments

Conjecture: If c is composite then n! == 1 (mod c) for at most one n >= 2. - David Wilson, Oct 06 2009

Links

D. Wilson, Table of n, a(n) for n = 1..1000

Crossrefs

Sequence in context: A252955 A171697 A172017 * A328973 A133626 A124074

Adjacent sequences: A049045 A049046 A049047 * A049049 A049050 A049051

Keyword

nonn

Author

David W. Wilson

Status

approved