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A062606 Numbers k such that 40^k - 39^k is prime. 0

%I #18 Jul 04 2021 07:54:52

%S 2,37,61,227,1163,2473

%N Numbers k such that 40^k - 39^k is prime.

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

%C No other terms less than 10^5. - _Robert Price_, Jul 24 2012

%o (PARI) is(n)=ispseudoprime(40^n-39^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

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)