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%I #26 Apr 03 2023 10:36:12
%S 25,26,28,33,49,80,81,133,179,202,222,271,411,588,682,1039,2403,5802,
%T 11544,12484,41047,46396
%N Numbers n>0 such that 666*10^n+7 is prime.
%C Some of the larger entries may only correspond to probable primes.
%H Chris Caldwell, The Prime Glossary, <a href="https://t5k.org/glossary/xpage/BeastlyPrime.html">Beastly prime</a>
%H G. L. Honaker, Jr. and Chris Caldwell, <a href="https://t5k.org/curios/cpage/16957.html">Prime Curios! 66600...00007 (28-digits)</a>
%H Henri & Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop/searchform.php?form=666*10^n%2B7&action=Search">PRP Records</a>
%H R. Ondrejka, <a href="http://www.utm.edu/research/primes/lists/top_ten/">The Top Ten: a Catalogue of Primal Configurations</a>
%t Select[Range[10^3], PrimeQ[666*10^# + 7] &] (* _Arkadiusz Wesolowski_, Sep 08 2011 *)
%Y Cf. A186086.
%K nonn,base,more
%O 1,1
%A _Arkadiusz Wesolowski_, Feb 23 2011
%E a(21) from _Arkadiusz Wesolowski_, May 25 2011
%E a(22) from _Arkadiusz Wesolowski_, May 28 2011
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