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A089079
Numbers n such that 7*n - 23 is prime.
1
4, 6, 10, 12, 16, 18, 22, 28, 36, 40, 42, 48, 58, 60, 66, 70, 76, 78, 88, 90, 100, 102, 106, 108, 112, 126, 130, 136, 142, 148, 156, 160, 168, 172, 178, 180, 186, 190, 192, 208, 210, 216, 222, 226, 232, 240, 246, 252, 258, 262, 270, 282, 286, 288, 298, 312, 318, 328, 330, 340, 342, 346, 352, 366, 376, 388, 390, 396
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.
PROG
(Magma) [n: n in [4..400]|IsPrime(7*n-23)] // Vincenzo Librandi, Dec 17 2010
(PARI) is(n)=isprime(7*n-23) \\ Charles R Greathouse IV, Jun 12 2017
CROSSREFS
a(n) = A024901(n) + 3.
Sequence in context: A310578 A165972 A156037 * A310579 A242877 A193948
KEYWORD
easy,nonn
AUTHOR
Giovanni Teofilatto, Dec 04 2003
EXTENSIONS
Corrected and extended by Vincenzo Librandi, Dec 17 2010
Offset corrected by Arkadiusz Wesolowski, Aug 09 2011
STATUS
approved