A062643 Numbers k such that 77^k - 76^k is prime.

19, 101, 5939

Offset

1,1

Comments

Terms > 1000 are often only strong pseudoprimes.

a(4) > 10^5. - Robert Price, Sep 01 2014

Links

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

Prog

(PARI) is(n)=ispseudoprime(77^n-76^n) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

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

Sequence in context: A142216 A027005 A061696 * A245528 A253218 A300774

Adjacent sequences: A062640 A062641 A062642 * A062644 A062645 A062646

Keyword

nonn,hard,bref

Author

Mike Oakes, May 18 2001, May 19 2001

Status

approved