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 A089253 Numbers n such that 2n - 5 is a prime. 28
 4, 5, 6, 8, 9, 11, 12, 14, 17, 18, 21, 23, 24, 26, 29, 32, 33, 36, 38, 39, 42, 44, 47, 51, 53, 54, 56, 57, 59, 66, 68, 71, 72, 77, 78, 81, 84, 86, 89, 92, 93, 98, 99, 101, 102, 108, 114, 116, 117, 119, 122, 123, 128, 131, 134, 137, 138, 141, 143, 144, 149, 156, 158, 159, 161 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 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 Shawn A. Broyles, Table of n, a(n) for n = 1..1000 FORMULA a(n) = A067076(n) + 4. - Giovanni Teofilatto, Dec 14 2003 MATHEMATICA (Prime[Range[2, 100]]+5)/2 (* Vladimir Joseph Stephan Orlovsky, Feb 08 2010 *) PROG (PARI) a(n)=prime(n+1)\2+3 \\ Charles R Greathouse IV, Oct 30 2012 CROSSREFS Numbers n such that 2n+k is prime: A005097 (k=1), A067076 (k=3), A089038 (k=5), A105760 (k=7), A155722 (k=9), A101448 (k=11), A153081 (k=13), A089559 (k=15), A173059 (k=17), A153143 (k=19). Numbers n such that 2n-k is prime: A006254 (k=1), A098090 (k=3), this sequence (k=5), A089192 (k=7), A097069 (k=9), A097338 (k=11), A097363 (k=13), A097480 (k=15), A098605 (k=17), A097932 (k=19). Sequence in context: A091242 A354834 A089585 * A047432 A095279 A030751 Adjacent sequences: A089250 A089251 A089252 * A089254 A089255 A089256 KEYWORD easy,nonn AUTHOR Giovanni Teofilatto, Dec 12 2003 EXTENSIONS Corrected by Ralf Stephan, Mar 03 2004 Further correction from Jeremy Gardiner, Sep 11 2004 STATUS approved

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Last modified July 20 15:15 EDT 2024. Contains 374459 sequences. (Running on oeis4.)