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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
OFFSET
1,3
COMMENTS
a(16) > 10^5. - Robert Price, Jan 24 2014
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
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