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Pseudoprimes to base 93.
1

%I #13 Aug 03 2014 14:01:13

%S 4,25,28,46,92,301,322,325,425,506,532,793,805,865,874,1081,1105,1393,

%T 1525,1645,1729,1771,2047,2071,2425,2465,2737,2926,3781,3913,4033,

%U 4187,4325,4465,4945,4996,5071,5149,5185,5405,5593,5713,5833,6601,6697,6721

%N Pseudoprimes to base 93.

%C Composite numbers n such that 93^(n-1) == 1 (mod n).

%H T. D. Noe, <a href="/A020221/b020221.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 = 93; 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_