A062636 Numbers k such that 70^k - 69^k is prime.

2, 11, 1301, 78989, 83117

Offset

1,1

Comments

Terms greater than 1000 are often only strong pseudoprimes.

a(6) > 10^5. - Robert Price Jan 15 2014

Links

Table of n, a(n) for n=1..5.

Prog

(PARI) is(n)=ispseudoprime(70^n-69^n) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

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

Sequence in context: A084673 A034388 A131316 * A343900 A343929 A051254

Adjacent sequences: A062633 A062634 A062635 * A062637 A062638 A062639

Keyword

nonn,hard,bref

Author

Mike Oakes, May 18 2001, May 19 2001

Extensions

a(4)-a(5) from Robert Price, Jan 15 2014 (Computer run by Adam Marciniec)

Status

approved