A138442 a(n) = ((n-th prime)^6-(n-th prime^2))/3.

20, 240, 5200, 39200, 590480, 1608880, 8045760, 15681840, 49345120, 198274160, 295834240, 855241680, 1583367520, 2107120400, 3593071040, 7388119440, 14060176720, 17173456880, 30152792560, 42700092960, 50444740320

Offset

1,1

Links

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

Formula

a(n) = A138409(n)/3. - R. J. Mathar, Oct 15 2017

Mathematica

a = {}; Do[p = Prime[n]; AppendTo[a, (p^6 - p^2)/3], {n, 1, 50}]; a

Prog

(PARI) forprime(p=2, 1e3, print1((p^6-p^2)/3", ")) \\ Charles R Greathouse IV, Jul 15 2011

Crossrefs

Sequence in context: A061121 A073398 A040075 * A341196 A140124 A123954

Adjacent sequences: A138439 A138440 A138441 * A138443 A138444 A138445

Keyword

nonn,easy

Author

Artur Jasinski, Mar 19 2008

Status

approved