A062633 Numbers k such that 67^k - 66^k is prime.

3, 5, 43, 2399, 88037

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(6) > 10^5. - Robert Price, Oct 03 2013

Crossrefs

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

Programs

PARI

is(n)=ispseudoprime(67^n-66^n) \\ Charles R Greathouse IV, Jun 13 2017

Extensions

a(5) from Robert Price, Oct 03 2013 (Computer run by Adam Marciniec)