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A020188 Pseudoprimes to base 60. 1

%I

%S 341,427,481,671,793,841,1729,1891,2257,2821,3133,3277,3599,3601,3661,

%T 4577,4777,6001,6161,6533,6601,6943,8911,8917,9937,10249,11521,12331,

%U 13333,13481,14701,14981,15841,16897,18889,20591,20801,21361,22321,23479

%N Pseudoprimes to base 60.

%C Composite numbers n such that 60^(n-1) == 1 (mod n). - _Michel Lagneau_, Feb 18 2012

%H T. D. Noe, <a href="/A020188/b020188.txt">Table of n, a(n) for n = 1..1000</a>

%H <a href="/index/Ps#pseudoprimes">Index entries for sequences related to pseudoprimes</a>

%t 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 *)

%Y Cf. A001567 (pseudoprimes to base 2).

%K nonn

%O 1,1

%A _David W. Wilson_

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Last modified August 13 22:57 EDT 2020. Contains 336473 sequences. (Running on oeis4.)