A133982 Numbers n such that 11^n - 2 is prime.

4, 6, 22420, 27636, 27850, 28986, 31168, 586020

Offset: 1

Author

Rick L. Shepherd, Sep 30 2007

Keywords

• hard
• nonn
• more

Comments

Corresponding primes are in A133858.

11^22420-2 is a 23349-digit probable prime found with PrimeForm.

a(8) > 10^5. - Robert Price, Mar 26 2014

a(4) through a(7) also correspond to probable primes. - Robert Price, Mar 27 2014

Crossrefs

Cf. A133858, A130652.

Programs

PARI

is(n)=ispseudoprime(11^n-2) \\ Charles R Greathouse IV, May 22 2017

Extensions

a(4)-a(7) from Robert Price, Mar 26 2014

a(8) from Paul Bourdelais, Nov 03 2021