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%I #10 Feb 23 2020 04:49:14
%S 3281,432821,973241,1551941,1683683,1898999,2202257,2545181,2586083,
%T 2795519,3020093,3028133,4042403,4099439,4561481,4923521,5087171,
%U 5173601,5193161,5774801,6710177,8243111,9846401
%N Strong pseudoprimes to base 3 of the form 6*k-1.
%C Motivated by the fact that most strong pseudoprimes to base 3 (A020229) are of the form 6*k+1.
%H Amiram Eldar, <a href="/A215565/b215565.txt">Table of n, a(n) for n = 1..2621</a> (calculated from the b-file at A020229)
%o (PARI) forstep(n=5,1e7,6,is_A020229(n) & print1(n","))
%Y Cf. A020229.
%K nonn
%O 1,1
%A _M. F. Hasler_, Aug 16 2012
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