%I #16 Feb 15 2015 19:31:42
%S 6,15,26,39,49,65,78,91,195,301,559,561,637,1105,1649,1729,2107,2465,
%T 2626,2665,2701,2821,3201,3913,4215,4753,5055,6305,6533,6601,7051,
%U 7107,7361,7543,8149,8321,8911,9331,9773,9881,10585,10621,12001,14491,14689
%N Pseudoprimes to base 79.
%C Composite numbers n such that 79^(n-1) == 1 (mod n).
%H T. D. Noe, <a href="/A020207/b020207.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 = 79; 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 *)
%t Select[Range[15000],CompositeQ[#]&&PowerMod[79,#-1,#]==1&] (* _Harvey P. Dale_, Feb 15 2015 *)
%Y Cf. A001567 (pseudoprimes to base 2).
%K nonn
%O 1,1
%A _David W. Wilson_