A138422 a(n) = (prime(n)^4 - prime(n)^2)/12.
1, 6, 50, 196, 1210, 2366, 6936, 10830, 23276, 58870, 76880, 156066, 235340, 284746, 406456, 657306, 1009490, 1153510, 1678886, 2117220, 2366076, 3245320, 3954286, 5227860, 7376656, 8670850, 9378356, 10922346, 11762190, 13586216, 21677376
Offset: 1
Links
- Vincenzo Librandi, Table of n, a(n) for n = 1..200
Programs
-
Magma
[(NthPrime((n))^4 - NthPrime((n))^2)/12: n in [1..40] ]; // Vincenzo Librandi, Jun 17 2011
-
Mathematica
a = {}; Do[p = Prime[n]; AppendTo[a, (p^4 - p^2)/12], {n, 1, 50}]; a -
PARI
forprime(p=2,1e3,print1((p^4-p^2)/12", ")) \\ Charles R Greathouse IV, Jul 15 2011
Formula
a(n) = A138402(n)/12. - R. J. Mathar, Oct 15 2017