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 A111199 Numbers n such that 4k + 9 is prime. 6
 1, 2, 5, 7, 8, 11, 13, 16, 20, 22, 23, 25, 26, 32, 35, 37, 41, 43, 46, 47, 55, 56, 58, 62, 65, 67, 68, 71, 76, 77, 82, 85, 86, 91, 95, 97, 98, 100, 103, 106, 110, 112, 113, 125, 128, 133, 137, 140, 142, 146, 148, 151, 152, 158, 161, 163, 166, 167, 173, 175, 181, 187 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Solutions of the equation (4*k+9)'=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)-2. - R. J. Mathar, Sep 23 2009 EXAMPLE If k=98 then 4*k + 9 = 401 (prime). PROG (PARI) is(n)=isprime(4*n+9) \\ Charles R Greathouse IV, Feb 20 2017 CROSSREFS Cf. A005098, A095278, A089986, A153238, A144562. Sequence in context: A189296 A051279 A288464 * A276545 A138671 A286693 Adjacent sequences:  A111196 A111197 A111198 * A111200 A111201 A111202 KEYWORD nonn AUTHOR Parthasarathy Nambi, Oct 24 2005 EXTENSIONS More terms from R. J. Mathar, Sep 23 2009 STATUS approved

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Last modified April 3 00:35 EDT 2020. Contains 333195 sequences. (Running on oeis4.)