A062644 Numbers k such that 78^k - 77^k is prime.

7, 5749

Offset: 1

Author

Mike Oakes, May 18 2001, May 19 2001

Keywords

• nonn
• hard
• bref
• more

Comments

Terms > 1000 are often only strong pseudoprimes.

a(3) > 10^5. - Robert Price, Oct 04 2014

Crossrefs

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

Programs

PARI

is(n)=ispseudoprime(78^n-77^n) \\ Charles R Greathouse IV, Jun 13 2017