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A020191 Pseudoprimes to base 63. 1

%I

%S 62,341,481,529,703,841,1105,1147,1417,1985,2071,2465,2509,3379,3565,

%T 3683,4033,4577,5161,5461,5662,6119,6533,6943,7141,7711,9073,9265,

%U 10585,13333,13747,14089,14689,14981,15458,18721,19345,19685,19951,21037,21361

%N Pseudoprimes to base 63.

%C Composite numbers n such that 63^(n-1) == 1 (mod n).

%H T. D. Noe, <a href="/A020191/b020191.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 = 63; 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 May 26 17:16 EDT 2022. Contains 354092 sequences. (Running on oeis4.)