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Numbers k such that 45^k - 44^k is prime or a strong pseudoprime.
2

%I #21 Jul 04 2021 08:43:23

%S 2,5,151,223,313,1277,8447

%N Numbers k such that 45^k - 44^k is prime or a strong pseudoprime.

%C a(8) > 10^5. - _Robert Price_, Jan 02 2013

%o (PARI) forprime(n=1,9999,ispseudoprime(45^n-44^n)&print1(n",")) \\ - _M. F. Hasler_, Sep 21 2013

%Y Cf. A000043, A057468, A059801-A059803, A062572-A062609, A215632, A062612-A062666.

%K nonn,hard

%O 1,1

%A _Mike Oakes_, May 18 2001, May 19 2001

%E Edited by _M. F. Hasler_, Sep 21 2013