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A020246 Strong pseudoprimes to base 20. 1


%S 21,671,889,1891,2059,2761,5461,7999,13051,15311,16441,21667,25681,

%T 34861,37901,38989,42127,49771,50737,54811,64681,68251,78961,85591,

%U 88831,92509,93031,96049,97921,105001,109061,111361,114841,123713,143009,145351

%N Strong pseudoprimes to base 20.

%H R. J. Mathar, <a href="/A020246/b020246.txt">Table of n, a(n) for n = 1..208</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 September 24 22:46 EDT 2021. Contains 347651 sequences. (Running on oeis4.)