%I #18 Jun 13 2018 09:17:09
%S 85,415,481,703,1105,1111,1411,1615,2465,2501,2509,2981,3145,3655,
%T 3667,4141,5713,6161,6533,6973,7055,7141,7201,7885,8401,8695,9061,
%U 10585,11441,13019,13579,13981,14023,14383,14491,15181,15251,15355,15521,16405,16745
%N Pseudoprimes to base 84.
%C Composite numbers n such that 84^(n-1) == 1 (mod n). - _Michel Lagneau_, Feb 18 2012
%H T. D. Noe, <a href="/A020212/b020212.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 = 84; 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_