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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 (list; graph; refs; listen; history; text; internal format)
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

Daniel Starodubtsev, Table of n, a(n) for n = 1..10000

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

Adjacent sequences:  A089950 A089951 A089952 * A089954 A089955 A089956

KEYWORD

nonn

AUTHOR

Giovanni Teofilatto, Jan 12 2004

EXTENSIONS

Offset corrected by Arkadiusz Wesolowski, Aug 09 2011

STATUS

approved

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Last modified December 5 12:04 EST 2021. Contains 349557 sequences. (Running on oeis4.)