A138431 a(n) = ((n-th prime)^5-(n-th prime)^2)/2.

14, 117, 1550, 8379, 80465, 185562, 709784, 1237869, 3217907, 10255154, 14314095, 34671294, 57927260, 73503297, 114671399, 209096342, 357460409, 422296290, 675060309, 902112155, 1036533132, 1538525079, 1969516877, 2792025764, 4293665424, 5255045150, 5796365067

Offset: 1

Author

Artur Jasinski, Mar 19 2008

Keywords

• nonn
• easy

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A138405.

Programs

Mathematica

a = {}; Do[p = Prime[n]; AppendTo[a, (p^5 - p^2)/2], {n, 1, 50}]; a
(#^5-#^2)/2&/@Prime[Range[30]] (* Harvey P. Dale, Feb 18 2024 *)

PARI

forprime(p=2,1e3,print1((p^5-p^2)/2", ")) \\ Charles R Greathouse IV, Jul 15 2011

Formula

a(n) = A138405(n)/2. - R. J. Mathar, Oct 15 2017