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A020247 Strong pseudoprimes to base 21. 1

%I #11 Aug 04 2015 14:15:33

%S 221,703,793,3781,7363,9061,11647,13051,17767,19669,19909,22681,27133,

%T 30073,31021,38503,41353,43213,58829,79081,80137,83569,88357,92509,

%U 96049,104653,107213,121987,127697,128627,129889,130561,133141,139679,139897

%N Strong pseudoprimes to base 21.

%H R. J. Mathar, <a href="/A020247/b020247.txt">Table of n, a(n) for n = 1..204</a>

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

%K nonn

%O 1,1

%A _David W. Wilson_

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Last modified March 28 10:55 EDT 2024. Contains 371241 sequences. (Running on oeis4.)