A062646 Numbers k such that 80^k - 79^k is prime.

7, 277, 6133

Offset: 1

Author

Mike Oakes, May 18 2001, May 19 2001

Keywords

• nonn
• hard
• bref

Comments

Terms > 1000 are often only strong pseudoprimes.

a(4) > 10^5. - Robert Price, Dec 12 2014

Crossrefs

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

Programs

PARI

is(n)=ispseudoprime(80^n-79^n) \\ Charles R Greathouse IV, Jun 13 2017