A138423 a(n) = (prime(n)^4 - prime(n)^3)/2.

4, 27, 250, 1029, 6655, 13182, 39304, 61731, 133837, 341446, 446865, 911754, 1378420, 1669647, 2387929, 3870802, 5955991, 6809430, 9925179, 12526885, 14004612, 19228521, 23443267, 31018636, 43808304, 51515050, 55729077

Offset: 1

Author

Artur Jasinski, Mar 19 2008

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..200

Programs

Magma

[(NthPrime((n))^4 - NthPrime((n))^3)/2: n in [1..30] ]; // Vincenzo Librandi, Jun 18 2011

Mathematica

a = {}; Do[p = Prime[n]; AppendTo[a, (p^4 - p^3)/2], {n, 1, 50}]; a
(#^4-#^3)/2&/@Prime[Range[30]] (* Harvey P. Dale, Dec 25 2024 *)

PARI

forprime(p=2,1e3,print1((p^4-p^3)/2", ")) \\ Charles R Greathouse IV, Jul 15 2011

Formula

a(n) = A138403(n)/2. - R. J. Mathar, Oct 15 2017