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%I #32 Jan 25 2022 08:36:38
%S 2,5,6,12,17,19,61,102,195,447,1250,1329,1935,3930,5837,7176,8724,
%T 20881,23936,61868,91920
%N Integers k such that 10^k - 39 is prime.
%C The next term, if one exists, is > 100000. - _Robert Price_, Apr 25 2011
%C See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "99961".
%H Makoto Kamada, <a href="https://stdkmd.net/nrr/prime/">List of near-repdigit-related prime numbers</a>.
%H <a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a>.
%e k=2 is a term because 10^2 - 39 = 61 (prime).
%e k=61 is a term because 10^61 - 39 = 9999999999999999999999999999999999999999999999999999999999961 (prime).
%Y Cf. A108330, A108328.
%K nonn,more
%O 1,1
%A _Parthasarathy Nambi_, Jul 01 2005
%E a(8)-a(12) from _Stefan Steinerberger_, Nov 05 2005
%E a(13)-a(19) from _Robert Price_, Dec 12 2010
%E Edited by _Ray Chandler_, Dec 23 2010
%E a(20)-a(21) from _Robert Price_, Apr 25 2011
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