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A152213 Numbers n such that 7^n + 12 is prime. 9
0, 1, 2, 9, 66, 164, 221, 224, 2058, 3224, 12284, 13457, 22277, 22761, 83381 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

a(16) > 10^5. - Robert Price, Jan 24 2014

LINKS

Table of n, a(n) for n=1..15.

MATHEMATICA

Select[Range[0, 84000], PrimeQ[7^#+12]&] (* Harvey P. Dale, Dec 03 2017 *)

PROG

(PARI) is(n)=ispseudoprime(7^n+12) \\ Charles R Greathouse IV, Feb 17 2017

CROSSREFS

Cf. A236371, A217131, A191469, A090669, A096305, A217130, A217132, A152213.

Sequence in context: A127056 A228696 A042255 * A259607 A214930 A089471

Adjacent sequences:  A152210 A152211 A152212 * A152214 A152215 A152216

KEYWORD

nonn,more

AUTHOR

Huseyin Azoguz (huseyin(AT)mmnetz.de), Nov 29 2008

EXTENSIONS

a(11)-a(15) from Robert Price, Jan 24 2014

STATUS

approved

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Last modified July 15 03:05 EDT 2020. Contains 335762 sequences. (Running on oeis4.)