A020157 - OEIS

%I #16 Aug 03 2014 14:01:10

%S 4,14,15,21,28,35,52,91,105,231,268,341,364,469,481,561,651,793,871,

%T 1105,1729,1876,1897,2105,2257,2821,3484,3523,4069,4371,4411,5149,

%U 5185,5356,5473,5565,5611,6097,6601,7161,7294,8321,8401,8421,8841,8911,11041,11581

%N Pseudoprimes to base 29.

%C Composite numbers n such that 29^(n-1) == 1 (mod n).

%H R. J. Mathar and T. D. Noe, <a href="/A020157/b020157.txt">Table of n, a(n) for n = 1..1000</a> (R. J. Mathar 864 terms)

%H <a href="/index/Ps#pseudoprimes">Index entries for sequences related to pseudoprimes</a>

%t base = 29; 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_