A020140 - OEIS

A020140

Pseudoprimes to base 12.

65, 91, 133, 143, 145, 247, 377, 385, 703, 1045, 1099, 1105, 1649, 1729, 1885, 1891, 2041, 2233, 2465, 2701, 2821, 2983, 3367, 3553, 5005, 5365, 5551, 5785, 6061, 6305, 6601, 8911, 9073, 10585, 11077, 12403, 12673, 12905, 13051, 13333, 13345, 13585

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Composite numbers n such that 12^(n-1) == 1 (mod n). - Michel Lagneau, Feb 18 2012

LINKS

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

Index entries for sequences related to pseudoprimes

MATHEMATICA

base = 12; t = {}; n = 1; While[Length[t] < 100, n++; If[! PrimeQ[n] && PowerMod[base, n-1, n] == 1, AppendTo[t, n]]]; t (* T. D. Noe, Feb 21 2012 *)

CROSSREFS

Cf. A001567 (pseudoprimes to base 2).

Sequence in context: A160055 A250642 A280755 * A283656 A020194 A094447

Adjacent sequences: A020137 A020138 A020139 * A020141 A020142 A020143

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved