A030007 a(n) = (prime(n)-3)*(prime(n)-5)/8.

0, 0, 1, 6, 10, 21, 28, 45, 78, 91, 136, 171, 190, 231, 300, 378, 406, 496, 561, 595, 703, 780, 903, 1081, 1176, 1225, 1326, 1378, 1485, 1891, 2016, 2211, 2278, 2628, 2701, 2926, 3160, 3321, 3570, 3828, 3916, 4371, 4465, 4656, 4753, 5356, 5995, 6216, 6328

Offset

2,4

Comments

All terms are triangular numbers. - Gary Detlefs, Apr 14 2012

Links

T. D. Noe, Table of n, a(n) for n = 2..1000

Mathematica

Table[(p - 3) (p - 5)/8, {p, Prime[Range[2, 50]]}] (* T. D. Noe, Apr 16 2012 *)

Crossrefs

Cf. A000217.

Sequence in context: A175648 A178661 A190273 * A323729 A372295 A058549

Adjacent sequences: A030004 A030005 A030006 * A030008 A030009 A030010

Keyword

nonn

Author

N. J. A. Sloane

Status

approved