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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
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
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.)