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 A081759 Numbers n such that 5n+6 is prime. 14
 1, 5, 7, 11, 13, 19, 25, 29, 35, 37, 41, 47, 49, 53, 55, 61, 65, 79, 83, 85, 91, 97, 103, 107, 113, 119, 125, 127, 131, 137, 139, 149, 151, 161, 163, 175, 181, 187, 193, 197, 203, 205, 209, 211, 217, 229, 233, 235, 239, 245, 257, 259, 263, 271, 275, 289 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Solutions of the equation (5*n+6)'=1, where n' is the arithmetic derivative of n. - Paolo P. Lava, Nov 15 2012 REFERENCES M. Cerasoli, F. Eugeni and M. Protasi, Elementi di Matematica Discreta, Bologna 1988 Emanuele Munarini and Norma Zagaglia Salvi, Matematica Discreta, UTET, CittaStudiEdizioni, Milano 1997 LINKS Nathaniel Johnston, Table of n, a(n) for n = 1..10000 FORMULA a(n) = 2*A024912(n) - 1. MAPLE A081759 := proc(n) option remember: local k: if(n=1)then return 1: fi: for k from procname(n-1)+1 do if(isprime(5*k+6))then return k: fi: od: end: seq(A081759(n), n=1..100); # Nathaniel Johnston, May 28 2011 MATHEMATICA Select[Range[300], PrimeQ[5# + 6] &] (* Ray Chandler, Dec 06 2006 *) PROG (MAGMA) [n: n in [0..300]| IsPrime(5*n + 6)]; // Vincenzo Librandi, Oct 16 2012 (PARI) is(n)=isprime(5*n+6) \\ Charles R Greathouse IV, Feb 17 2017 CROSSREFS Cf. A024912, A030430, A049511, A067076, A087505, A089192, A089253. Sequence in context: A084441 A180950 A112397 * A155053 A152468 A267945 Adjacent sequences:  A081756 A081757 A081758 * A081760 A081761 A081762 KEYWORD easy,nonn AUTHOR Giovanni Teofilatto, Nov 21 2003 EXTENSIONS Corrected by Ray Chandler, Nov 22 2003 STATUS approved

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Last modified September 29 07:08 EDT 2020. Contains 337425 sequences. (Running on oeis4.)