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

61, 9883, 64693

Offset: 1

Author

Mike Oakes, May 18 2001, May 19 2001

Keywords

• nonn
• hard
• bref

Comments

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

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

Crossrefs

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

Programs

PARI

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

Extensions

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