A089255 Odd numbers n such that 2*n-5 is a prime.

5, 9, 11, 17, 21, 23, 29, 33, 39, 47, 51, 53, 57, 59, 71, 77, 81, 89, 93, 99, 101, 117, 119, 123, 131, 137, 141, 143, 149, 159, 161, 171, 177, 179, 189, 197, 201, 203, 207, 213, 219, 227, 231, 233, 257, 263, 273, 281, 287, 291, 299, 303, 309, 311, 323, 329, 333

Offset: 1

Author

Giovanni Teofilatto, Dec 12 2003

Keywords

• easy
• nonn

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.

Crossrefs

Cf. A089253, A002144.

Extensions

Corrected sequence and extended by Vincenzo Librandi, Mar 30 2010

Offset corrected by Arkadiusz Wesolowski, Aug 09 2011