A062654 Numbers k such that 88^k - 87^k is prime or a strong pseudoprime.

5, 7, 19, 241, 607, 74047

Offset: 1

Author

Mike Oakes, May 18 2001, May 19 2001

Keywords

• nonn
• hard

Comments

All terms must be prime. - M. F. Hasler, Sep 21 2013

a(7) > 10^5. - Robert Price, May 28 2015

Crossrefs

Cf. A000043, A057468, A059801, A059802, A059803, A062572-A062652, A215536, A062655-A062666.

Programs

Mathematica

Select[Range[0, 1000], PrimeQ[88^# - 87^#] &] (* Robert Price, May 28 2015 *)

PARI

is(n)=ispseudoprime(88^n-87^n) \\ Charles R Greathouse IV, Jun 13 2017

Extensions

Edited by M. F. Hasler, Sep 21 2013

a(6) from Robert Price, May 28 2015 (computer run by Adam Marciniec)