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A309532 Numbers k such that (121^k + 1)/122 is prime. 0
5, 13, 97, 1499, 11321, 320483 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The corresponding primes are terms of A059055. - Bernard Schott, Aug 09 2019

LINKS

Table of n, a(n) for n=1..6.

MATHEMATICA

Do[p=Prime[n]; If[PrimeQ[(121^p + 1)/122], Print[p]], {n, 1, 1000000}]

PROG

(PARI) is(n)=ispseudoprime((121^n+1)/122)

CROSSREFS

Cf. A059055.

Sequence in context: A304663 A306167 A107171 * A123646 A123622 A337749

Adjacent sequences:  A309529 A309530 A309531 * A309533 A309534 A309535

KEYWORD

nonn,more

AUTHOR

Paul Bourdelais, Aug 06 2019

STATUS

approved

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Last modified September 30 12:21 EDT 2020. Contains 337439 sequences. (Running on oeis4.)