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 A217130 Numbers n such that 7^n + 6 is prime. 10
 0, 1, 3, 16, 36, 244, 315, 2577, 9500, 17596, 25551, 32193, 32835, 36504, 75136 (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, 5000], PrimeQ[7^# + 6] &] PROG (PARI) for(n=1, 5000, if(isprime(7^n+6), print1(n", "))) (Magma) /* The code produces the sequence up to 315: */ [n: n in [0..2000] | IsPrime(7^n+6)]; CROSSREFS Cf. A236371, A217131, A191469, A090669, A096305, A217130, A217132, A152213. Sequence in context: A359559 A076153 A031302 * A173390 A173891 A066875 Adjacent sequences: A217127 A217128 A217129 * A217131 A217132 A217133 KEYWORD nonn AUTHOR Vincenzo Librandi, Oct 01 2012 EXTENSIONS a(9)-a(15) from Robert Price, Jan 24 2014 STATUS approved

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Last modified May 30 14:11 EDT 2023. Contains 363055 sequences. (Running on oeis4.)