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 A027756 Numbers k such that k^2 + k + 7 is prime. 3
 0, 2, 3, 5, 8, 9, 11, 12, 17, 18, 24, 26, 29, 30, 32, 33, 38, 39, 44, 50, 51, 57, 59, 65, 71, 74, 86, 89, 92, 95, 96, 99, 102, 108, 113, 122, 123, 128, 131, 134, 135, 137, 141, 143, 144, 156, 159, 164, 165, 170, 173, 176, 177, 180, 183, 198, 201, 206 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 P. De Geest, World!Of Numbers MATHEMATICA Select[Range[0, 250], PrimeQ[#^2+#+7]&] (* Harvey P. Dale, Oct 10 2011 *) PROG (MAGMA) [n: n in [0..250] | IsPrime(n^2+n+7)]; // Vincenzo Librandi, Nov 20 2010 (PARI) is(n)=isprime(n^2+n+7) \\ Charles R Greathouse IV, Feb 20 2017 CROSSREFS Cf. A005471 (associated primes). Sequence in context: A096974 A286486 A285092 * A119863 A285253 A047254 Adjacent sequences:  A027753 A027754 A027755 * A027757 A027758 A027759 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified August 18 02:34 EDT 2022. Contains 356204 sequences. (Running on oeis4.)