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A155722 Numbers k such that 2*k + 9 is prime. 25
1, 2, 4, 5, 7, 10, 11, 14, 16, 17, 19, 22, 25, 26, 29, 31, 32, 35, 37, 40, 44, 46, 47, 49, 50, 52, 59, 61, 64, 65, 70, 71, 74, 77, 79, 82, 85, 86, 91, 92, 94, 95, 101, 107, 109, 110, 112, 115, 116, 121, 124, 127, 130, 131, 134, 136, 137, 142, 149, 151, 152, 154, 161, 164 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Subsequence of A001651; A011655(a(n)) = 1. - Reinhard Zumkeller, Jul 09 2010
One less than the associated entry in A105760, two less than in A089038, three less than in A067076. - R. J. Mathar, Jan 05 2011
LINKS
MATHEMATICA
(Prime[Range[5, 100]] - 9)/2 (* Vladimir Joseph Stephan Orlovsky, Feb 08 2010 *)
Select[Range[0, 200], PrimeQ[2 # + 9]&] (* Vincenzo Librandi, Sep 24 2012 *)
PROG
(Magma) [n: n in [0..200] | IsPrime(2*n+9)]; // Vincenzo Librandi, Sep 24 2012
(PARI) is(n)=isprime(2*n+9) \\ Charles R Greathouse IV, Jul 12 2016
(Sage) [n for n in (0..200) if is_prime(2*n+9) ] # G. C. Greubel, May 21 2019
(GAP) Filtered([0..200], k-> IsPrime(2*k+9) ) # G. C. Greubel, May 21 2019
CROSSREFS
Numbers h such that 2*h + k is prime: A005097 (k=1), A067076 (k=3), A089038 (k=5), A105760 (k=7), this seq (k=9), A101448 (k=11), A153081 (k=13), A089559 (k=15), A173059 (k=17), A153143 (k=19).
Sequence in context: A039672 A014370 A095278 * A049045 A153766 A319301
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Jan 25 2009
EXTENSIONS
Edited by N. J. A. Sloane, Jun 23 2010
Definition clarified by Zak Seidov, Jul 11 2014
STATUS
approved

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Last modified July 20 13:32 EDT 2024. Contains 374445 sequences. (Running on oeis4.)