A062609 - OEIS

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A062609

Numbers k such that 43^k - 42^k is prime or a strong pseudoprime.

%I #17 Jul 04 2021 08:43:19

%S 3,13,43,211

%N Numbers k such that 43^k - 42^k is prime or a strong pseudoprime.

%C a(5) > 10^5 - _Robert Price_, Dec 24 2012

%o (PARI) forprime(n=1, 9999, ispseudoprime(43^n-42^n) && print1(n", ")) \\ - M. F. Hasler, Sep 21 2013

%Y Cf. A000043, A057468, A059801-A059803, A062572-A062608, A215632, A062611-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