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

2, 3, 53, 101, 223, 1699

Offset: 1

Author

Mike Oakes, May 18 2001, May 19 2001

Keywords

• nonn
• hard

Comments

Terms greater than 1000 are often only strong pseudoprimes.

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

Crossrefs

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

Programs

PARI

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