A090670 Odd numbers k such that 2*k-3 is a prime of the form 4*j+3.

3, 5, 7, 11, 13, 17, 23, 25, 31, 35, 37, 41, 43, 53, 55, 65, 67, 71, 77, 83, 85, 91, 97, 101, 107, 113, 115, 121, 127, 133, 137, 143, 155, 157, 167, 175, 181, 185, 191, 193, 211, 217, 221, 223, 233, 235, 241, 245, 247, 251, 253, 263, 275, 283, 287, 295, 301, 305

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

Vincenzo Librandi, Table of n, a(n) for n = 1..10000

Formula

a(n) = A087915(n)+3.

Mathematica

okQ[n_]:=Module[{x=2n-3}, PrimeQ[x]&&IntegerQ[(x-3)/4]]; Select[Range[1, 315, 2], okQ]  (* Harvey P. Dale, Jan 12 2011 *)

Crossrefs

Cf. A087915, A002145.

Cf. A050415 (primes of the form 2^k-3).

Sequence in context: A249876 A096169 A225526 * A074832 A075794 A192864

Adjacent sequences: A090667 A090668 A090669 * A090671 A090672 A090673

Keyword

easy,nonn

Author

Giovanni Teofilatto, Dec 17 2003

Extensions

Offset changed from 0 to 1 by Vincenzo Librandi, Dec 13 2011

Status

approved