A062605 Numbers k such that 39^k - 38^k is prime.

3, 7, 13, 41

Offset

1,1

Comments

Terms greater than 1000 are often only strong pseudoprimes.

a(5) > 10^5. - Robert Price, Nov 13 2012

Links

Table of n, a(n) for n=1..4.

Prog

(PARI) is(n)=ispseudoprime(39^n-38^n) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

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

Sequence in context: A155225 A051842 A147447 * A191974 A174241 A289556

Adjacent sequences: A062602 A062603 A062604 * A062606 A062607 A062608

Keyword

nonn,hard

Author

Mike Oakes, May 18 2001

Status

approved