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A133858 Primes of the form 11^n - 2. 3
14639, 1771559 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The only currently known primes of the form 11^n - 2 correspond to numbers n = {4, 6}. Last digit of a(n) is 9.

11^n-2 is also prime (probable prime) for n in {22420, 27636, 27850, 28986, 31168}. - Robert Price, Mar 26 2014

LINKS

Table of n, a(n) for n=1..2.

EXAMPLE

a(1) = 11^4 - 2 = 14639,

a(2) = 11^6 - 2 = 1771559.

CROSSREFS

Cf. A104096 = Largest prime <= 11^n. Cf. A130652 = 11^n - 2. Cf. A128472 = smallest prime of the form (2n-1)^k - 2 for k>(2n-1). Cf. A084714 = smallest prime of the form (2n-1)^k - 2. Cf. A014224, A109080, A090669, A128455, A128457, A128458, A128459, A128460, A128461.

Cf. A133982.

Sequence in context: A032736 A032738 A252218 * A023683 A231118 A017284

Adjacent sequences:  A133855 A133856 A133857 * A133859 A133860 A133861

KEYWORD

bref,hard,more,nonn

AUTHOR

Alexander Adamchuk, Sep 27 2007

STATUS

approved

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Last modified May 28 10:49 EDT 2020. Contains 334681 sequences. (Running on oeis4.)