%I #14 Aug 03 2014 14:01:12
%S 86,91,133,217,247,301,385,403,473,559,589,817,1045,1105,1111,1333,
%T 1661,1705,1729,2047,2365,2626,2651,2821,3553,3565,3785,3913,4123,
%U 4141,4681,5005,5461,5719,6533,6601,7471,7483,7657,8029,8041,8401,8686,8911,9331
%N Pseudoprimes to base 87.
%C Composite numbers n such that 87^(n-1) == 1 (mod n).
%H T. D. Noe, <a href="/A020215/b020215.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 = 87; 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_