A062628 Numbers k such that 62^k - 61^k is prime.

17, 23, 421, 1303, 6163, 17117, 18439, 74521

Offset: 1

Author

Mike Oakes, May 18 2001, May 19 2001

Keywords

• nonn
• hard

Comments

Terms greater than 1000 are often only strong pseudoprimes.

All terms are primes. - Robert Price, May 07 2013

a(9) > 10^5. - Robert Price, May 07 2013

Crossrefs

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

Programs

PARI

is(n)=ispseudoprime(62^n-61^n) \\ Charles R Greathouse IV, Jun 13 2017

Extensions

a(6)-a(8) (Computer runs by Adam Marciniec) from Robert Price, May 07 2013