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%I #21 Jul 04 2021 09:00:30
%S 3,17,293,1303,3331,4639,7043,35201,46441
%N Numbers k such that 56^k - 55^k is a prime.
%C Terms greater than 1000 often correspond only to strong pseudoprimes. [Clarified by _M. F. Hasler_, Sep 15 2013]
%C a(10) > 10^5. - _Robert Price_, Oct 26 2013
%Y Cf. A000043, A057468, A059801, A059802, A062572-A062666.
%K nonn,hard
%O 1,1
%A _Mike Oakes_, May 18 2001, May 19 2001
%E a(8)-a(9) from _Robert Price_, Oct 26 2013