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A089953
Numbers n such that 3*n+7 is prime.
4
0, 2, 4, 8, 10, 12, 18, 20, 22, 24, 30, 32, 34, 40, 44, 48, 50, 52, 58, 62, 64, 68, 72, 74, 78, 88, 90, 92, 100, 102, 108, 110, 114, 120, 122, 124, 130, 134, 138, 142, 144, 150, 152, 160, 164, 172, 178, 180, 188, 190, 198, 200, 202, 204, 208, 212, 218, 222, 228
OFFSET
1,2
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) = A034936(n)-1 = A024892(n)-2 = 2*A024899(n)-2.
PROG
(PARI) is(n)=isprime(3*n+7) \\ Charles R Greathouse IV, May 22 2017
CROSSREFS
Cf. A002476 gives primes, A034936, A024892, A024899.
Sequence in context: A098968 A032368 A134533 * A155133 A331669 A154788
KEYWORD
nonn
AUTHOR
Giovanni Teofilatto, Jan 12 2004
EXTENSIONS
Offset corrected by Arkadiusz Wesolowski, Aug 09 2011
STATUS
approved