login
Pseudoprimes to base 74.
1

%I #18 Jun 13 2018 09:17:37

%S 15,25,75,91,175,219,325,365,427,435,511,561,793,949,1095,1105,1387,

%T 1525,1729,1825,1891,2275,2465,2821,4453,4577,4795,5185,5475,5551,

%U 6175,6533,6541,6601,6643,7421,7613,8911,10585,10675,11041,12607,12775,12871,13019

%N Pseudoprimes to base 74.

%C Composite numbers n such that 74^(n-1) == 1 (mod n). - _Michel Lagneau_, Feb 18 2012

%H T. D. Noe, <a href="/A020202/b020202.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 = 74; 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_