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A217352 Numbers n such that 6^n - 7 is prime. 3
2, 4, 6, 8, 9, 10, 15, 20, 46, 49, 61, 98, 110, 144, 266, 344, 978, 1692, 1880, 1924, 3142, 3220, 4209, 5708, 7064 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..25.

MATHEMATICA

Select[Range[10000], PrimeQ[6^# - 7] &]

PROG

(PARI) is(n)=ispseudoprime(6^n-7) \\ Charles R Greathouse IV, Jun 13 2017

CROSSREFS

Cf. A059614, A217351.

Sequence in context: A100417 A070089 A069167 * A036627 A191982 A080037

Adjacent sequences:  A217349 A217350 A217351 * A217353 A217354 A217355

KEYWORD

nonn

AUTHOR

Vincenzo Librandi, Oct 02 2012

STATUS

approved

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Last modified October 18 18:58 EDT 2018. Contains 316323 sequences. (Running on oeis4.)