A062638 Numbers k such that 72^k - 71^k is prime.

61, 9883, 64693

Offset

1,1

Comments

Integers corresponding to n greater than 1000 are often only strong pseudoprimes.

a(4) > 10^5. - Robert Price, Mar 20 2014

Links

Table of n, a(n) for n=1..3.

Prog

(PARI) is(n)=ispseudoprime(72^n-71^n) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Cf. A000043, A057468, A059801, A059802, A062572-A062666.

Sequence in context: A103915 A090823 A093261 * A261238 A197105 A195216

Adjacent sequences: A062635 A062636 A062637 * A062639 A062640 A062641

Keyword

nonn,hard,bref

Author

Mike Oakes, May 18 2001, May 19 2001

Extensions

a(3) from Robert Price, Mar 20 2014 (computer run by Adam Marciniec)

Status

approved