A020188 - OEIS

A020188

Pseudoprimes to base 60.

341, 427, 481, 671, 793, 841, 1729, 1891, 2257, 2821, 3133, 3277, 3599, 3601, 3661, 4577, 4777, 6001, 6161, 6533, 6601, 6943, 8911, 8917, 9937, 10249, 11521, 12331, 13333, 13481, 14701, 14981, 15841, 16897, 18889, 20591, 20801, 21361, 22321, 23479

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OFFSET

1,1

COMMENTS

Composite numbers n such that 60^(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 = 60; 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: A025335 A025327 A101852 * A025353 A025345 A337715

Adjacent sequences: A020185 A020186 A020187 * A020189 A020190 A020191

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved