A020143 - OEIS

A020143

Pseudoprimes to base 15.

14, 341, 742, 946, 1477, 1541, 1687, 1729, 1891, 1921, 2821, 3133, 3277, 4187, 6541, 6601, 7471, 8701, 8911, 9073, 10279, 10649, 12871, 14041, 14701, 15409, 15841, 16841, 19201, 20017, 24521, 25313, 25546, 28063, 29341, 30889, 31021, 38963, 41041

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OFFSET

1,1

COMMENTS

Composite numbers n such that 15^(n-1) == 1 (mod n).

LINKS

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

Index entries for sequences related to pseudoprimes

MATHEMATICA

base = 15; 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: A278194 A035273 A239783 * A161927 A253457 A239784

Adjacent sequences: A020140 A020141 A020142 * A020144 A020145 A020146

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved