A062641 Numbers k such that 75^k - 74^k is prime.

2, 3, 53, 101, 223, 1699

Offset

1,1

Comments

Terms greater than 1000 are often only strong pseudoprimes.

a(7) > 10^5. - Robert Price, Jun 29 2014

Links

Table of n, a(n) for n=1..6.

Prog

(PARI) is(n)=ispseudoprime(75^n-74^n) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

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

Sequence in context: A090231 A202701 A342408 * A339920 A344732 A037424

Adjacent sequences: A062638 A062639 A062640 * A062642 A062643 A062644

Keyword

nonn,hard

Author

Mike Oakes, May 18 2001, May 19 2001

Status

approved