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%I #13 Jun 07 2021 04:41:39
%S 17,20231,83233,3828719,8519143,39951841,68916943,76672279,144326023,
%T 721630111,35915273857,39392517233,42845049953,83709099119
%N Primes dividing terms of A128358.
%C A prime p is in this sequence if the multiplicative order of 18 modulo p equals the product of smaller primes from this sequence. - _Max Alekseyev_, Sep 24 2009
%e A128358 begins with {1, 17, 17^2, 17^3, 17^4, 17^5, 20231*17^2, 83233*17^2, ...}. Thus 17, 20231, 83233 are in this sequence.
%Y Cf. A128356, A128357, A128358.
%K nonn,hard,more
%O 1,1
%A _Alexander Adamchuk_, Jan 31 2008
%E Edited and extended by _Max Alekseyev_, Jul 28 2009
%E a(11)-a(14) from _Max Alekseyev_, May 26 2010
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