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 A089192 Numbers n such that 2n - 7 is a prime. 25
 5, 6, 7, 9, 10, 12, 13, 15, 18, 19, 22, 24, 25, 27, 30, 33, 34, 37, 39, 40, 43, 45, 48, 52, 54, 55, 57, 58, 60, 67, 69, 72, 73, 78, 79, 82, 85, 87, 90, 93, 94, 99, 100, 102, 103, 109, 115, 117, 118, 120, 123, 124, 129, 132, 135, 138, 139, 142, 144, 145, 150, 157, 159, 160 (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 MATHEMATICA Select[Range[3, 200], PrimeQ[2#-7]&] (* Harvey P. Dale, Aug 24 2014 *) PROG (PARI) is(n)=isprime(2*n - 7) \\ Charles R Greathouse IV, Apr 28 2015 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), A089253 (k=5), this sequence (k=7), A097069 (k=9), A097338 (k=11), A097363 (k=13), A097480 (k=15), A098605 (k=17), A097932 (k=19). Sequence in context: A066263 A178096 A246782 * A279195 A232710 A132829 Adjacent sequences: A089189 A089190 A089191 * A089193 A089194 A089195 KEYWORD easy,nonn AUTHOR Giovanni Teofilatto, Dec 08 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 13:32 EDT 2024. Contains 374445 sequences. (Running on oeis4.)