A062613 Numbers k such that 47^k - 46^k is prime.

5, 17, 67, 73, 691, 9781, 79201, 89113

Offset

1,1

Comments

Terms greater than 1000 are often only strong pseudoprimes.

a(9) > 10^5 - Robert Price, Oct 10 2012

Links

Table of n, a(n) for n=1..8.

Prog

(PARI) is(n)=ispseudoprime(47^n-46^n) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

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

Sequence in context: A149677 A273856 A012765 * A153323 A059847 A149678

Adjacent sequences: A062610 A062611 A062612 * A062614 A062615 A062616

Keyword

nonn,hard

Author

Mike Oakes, May 18 2001, May 19 2001

Extensions

a(7)-a(8) from Robert Price, Oct 10 2012 (computer run by Adam Marciniec)

Status

approved