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A020188 Pseudoprimes to base 60. 1
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 (list; graph; refs; listen; history; text; internal format)
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 A253038

Adjacent sequences:  A020185 A020186 A020187 * A020189 A020190 A020191

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified June 24 04:38 EDT 2019. Contains 324318 sequences. (Running on oeis4.)