

A089238


Numbers n such that 3*n^2/2  1 is a prime.


0



2, 4, 6, 10, 14, 16, 20, 24, 26, 34, 40, 44, 54, 56, 60, 64, 70, 76, 86, 90, 104, 110, 116, 120, 124, 126, 130, 136, 140, 146, 150, 154, 164, 166, 174, 186, 194, 200, 204, 230, 240, 244, 260, 264, 286, 300, 306, 336, 346, 354, 374, 386, 394, 400, 414, 416, 420
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OFFSET

1,1


COMMENTS

All terms must be even numbers.  Harvey P. Dale, Jul 03 2017


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

Table of n, a(n) for n=1..57.


MATHEMATICA

Select[Range[0, 500, 2], PrimeQ[(3#^2)/21]&] (* Harvey P. Dale, Jul 03 2017 *)


PROG

(PARI) forstep(n=2, 1000, 2, if(isprime(3*n^2/21), print1(n, ", ")))  Rick L. Shepherd, May 06 2008


CROSSREFS

Cf. A090686.
Sequence in context: A075574 A104692 A066755 * A005574 A109807 A259645
Adjacent sequences: A089235 A089236 A089237 * A089239 A089240 A089241


KEYWORD

nonn


AUTHOR

Giovanni Teofilatto, Dec 22 2003


EXTENSIONS

Corrected and extended by Rick L. Shepherd, May 06 2008


STATUS

approved



