A062652 Numbers k such that 86^k - 85^k is prime.

5, 11, 103, 227, 1637, 9677, 41597

Offset

1,1

Comments

Terms greater than 1000 are often only strong pseudoprimes.

All terms are prime. - Robert Price, Apr 14 2014

a(8) > 10^5. - Robert Price, Apr 14 2015

Links

Table of n, a(n) for n=1..7.

Mathematica

Select[Range[0, 300], If[PrimeQ[#], PrimeQ[86^# - 85^#]] &] (* Robert Price, Apr 14 2015 *)

Prog

(PARI) is(n)=ispseudoprime(86^n-85^n) \\ Charles R Greathouse IV, Jun 12 2017

Crossrefs

Cf. A000043, A057468, A059801, A059802, A062572-A062666, A215536 (primes 87^n - 86^n).

Sequence in context: A201074 A056111 A090160 * A075706 A338083 A236509

Adjacent sequences: A062649 A062650 A062651 * A062653 A062654 A062655

Keyword

nonn,hard

Author

Mike Oakes, May 18 2001, May 19 2001

Extensions

a(7) from Robert Price (computer run by Adam Marciniec), Apr 14 2015

Status

approved