A030007 - OEIS

%I #14 Jan 29 2019 19:23:43

%S 0,0,1,6,10,21,28,45,78,91,136,171,190,231,300,378,406,496,561,595,

%T 703,780,903,1081,1176,1225,1326,1378,1485,1891,2016,2211,2278,2628,

%U 2701,2926,3160,3321,3570,3828,3916,4371,4465,4656,4753,5356,5995,6216,6328

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

%C All terms are triangular numbers. - _Gary Detlefs_, Apr 14 2012

%H T. D. Noe, <a href="/A030007/b030007.txt">Table of n, a(n) for n = 2..1000</a>

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

%Y Cf. A000217.

%K nonn

%O 2,4

%A _N. J. A. Sloane_