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Numbers k such that 37^k - 36^k is prime.
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%I #24 Jul 04 2021 07:53:34

%S 2,83,113,1429,3919,18427,38461

%N Numbers k such that 37^k - 36^k is prime.

%C Terms greater than 1000 are often only strong pseudoprimes.

%C a(8) > 10^5. - _Robert Price_, Jun 12 2012

%o (PARI) is(n)=ispseudoprime(37^n-36^n) \\ _Charles R Greathouse IV_, Jun 13 2017

%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(6) and a(7) (computed by Adam Marciniec) from _Robert Price_, Jun 12 2012