A138443 a(n) = ((n-th prime)^6-(n-th prime^2))/4.

15, 180, 3900, 29400, 442860, 1206660, 6034320, 11761380, 37008840, 148705620, 221875680, 641431260, 1187525640, 1580340300, 2694803280, 5541089580, 10545132540, 12880092660, 22614594420, 32025069720, 37833555240

Offset

1,1

Links

Table of n, a(n) for n=1..21.

Formula

a(n) = A138409(n)/4. - R. J. Mathar, Oct 15 2017

Mathematica

a = {}; Do[p = Prime[n]; AppendTo[a, (p^6 - p^2)/4], {n, 1, 50}]; a

Prog

(PARI) forprime(p=2, 1e3, print1((p^6-p^2)/4", ")) \\ Charles R Greathouse IV, Jul 15 2011

Crossrefs

Sequence in context: A055084 A005461 A373759 * A235455 A016158 A335509

Adjacent sequences: A138440 A138441 A138442 * A138444 A138445 A138446

Keyword

nonn,easy

Author

Artur Jasinski, Mar 19 2008

Status

approved