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A217136
Numbers k such that 3^k + 8 is prime.
18
1, 2, 4, 5, 8, 13, 14, 20, 38, 44, 77, 88, 124, 152, 244, 557, 2429, 4382, 6268, 18488, 75097, 81998, 96460, 143497
OFFSET
1,2
COMMENTS
a(25) > 2*10^5. - Robert Price, Sep 25 2013
MATHEMATICA
Select[Range[0, 5000], PrimeQ[3^# + 8] &]
PROG
(PARI) for(n=1, 5*10^3, if(isprime(3^n+8), print1(n", ")))
CROSSREFS
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Oct 01 2012
EXTENSIONS
a(19)-a(24) from Robert Price, Sep 25 2013
STATUS
approved