A062650 Numbers k such that 84^k - 83^k is prime.

2, 41, 67, 7699, 12409

Offset: 1

Author

Mike Oakes, May 18 2001, May 19 2001

Keywords

• nonn
• hard
• more

Comments

Terms greater than 1000 are often only strong pseudoprimes.

a(6) > 20000. - Derek Orr, Sep 22 2014

a(6) > 10^5. - Robert Price, Mar 05 2015

Crossrefs

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

Programs

PARI

is(n)=ispseudoprime(84^n-83^n) \\ Charles R Greathouse IV, Jun 13 2017

Extensions

a(5) from Derek Orr, Sep 22 2014