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A062598 Numbers k such that 32^k - 31^k is prime. 0

%I #20 Jul 04 2021 07:53:50

%S 5,1427,2357,24499

%N Numbers k such that 32^k - 31^k is prime.

%C Terms > 1000 often correspond only to strong pseudoprimes.

%C a(5) > 10^5. - _Robert Price_, Oct 03 2012

%o (PARI) is(n)=ispseudoprime(32^n-31^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(4) from _Robert Price_, Oct 03 2012

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Last modified April 23 07:57 EDT 2024. Contains 371905 sequences. (Running on oeis4.)