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 A111215 Numbers k such that 4k + 5 is prime. 4
 0, 2, 3, 6, 8, 9, 12, 14, 17, 21, 23, 24, 26, 27, 33, 36, 38, 42, 44, 47, 48, 56, 57, 59, 63, 66, 68, 69, 72, 77, 78, 83, 86, 87, 92, 96, 98, 99, 101, 104, 107, 111, 113, 114, 126, 129, 134, 138, 141, 143, 147, 149, 152, 153, 159, 162, 164, 167, 168, 174, 176, 182, 188 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Solutions of the equation (4*k+5)' = 1, where k' is the arithmetic derivative of k. - Paolo P. Lava, Jan 03 2013 LINKS Daniel Starodubtsev, Table of n, a(n) for n = 1..10000 FORMULA a(n) = A005098(n) - 1. - Daniel Starodubtsev, Feb 10 2020 EXAMPLE If k=99 then 4k + 5 = 401 (prime). MATHEMATICA Select[Range[0, 200], PrimeQ[4#+5]&] (* Harvey P. Dale, Dec 07 2013 *) PROG (MAGMA) [n: n in [0..200] | IsPrime(4*n+5)]; - Vincenzo Librandi, Nov 13 2010 (PARI) is(n)=isprime(4*n+5) \\ Charles R Greathouse IV, Aug 31 2015 CROSSREFS Cf. A005098, A095278. Sequence in context: A135768 A287659 A047244 * A099381 A289943 A089437 Adjacent sequences:  A111212 A111213 A111214 * A111216 A111217 A111218 KEYWORD nonn,easy AUTHOR Parthasarathy Nambi, Oct 24 2005 STATUS approved

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Last modified April 11 09:24 EDT 2021. Contains 342886 sequences. (Running on oeis4.)