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 A024902 Numbers k such that 7*k + 4 is prime. 4
 1, 7, 9, 15, 19, 21, 25, 27, 37, 39, 49, 55, 61, 69, 79, 81, 85, 87, 91, 97, 105, 115, 117, 129, 139, 141, 145, 147, 151, 157, 159, 169, 171, 175, 189, 205, 207, 211, 217, 225, 229, 231, 237, 247, 249, 255, 261, 267, 271, 285, 289, 295, 297, 301, 307, 319, 321, 327, 339, 349 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 MATHEMATICA Select[Range[400], PrimeQ[7 # + 4] &] (* Vincenzo Librandi, Sep 26 2012 *) PROG (MAGMA) [n: n in [1..400] | IsPrime(7*n+4)]; // Vincenzo Librandi, Nov 20 2010 (PARI) is(n)=isprime(7*n+4) \\ Charles R Greathouse IV, Feb 20 2017 CROSSREFS Cf. A045471 (associated primes). Sequence in context: A347436 A047522 A112072 * A111312 A158891 A213220 Adjacent sequences:  A024899 A024900 A024901 * A024903 A024904 A024905 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified July 6 11:37 EDT 2022. Contains 355110 sequences. (Running on oeis4.)