A138424 a(n) = (prime(n)^5 - prime(n))/2.
15, 120, 1560, 8400, 80520, 185640, 709920, 1238040, 3218160, 10255560, 14314560, 34671960, 57928080, 73504200, 114672480, 209097720, 357462120, 422298120, 675062520, 902114640, 1036535760, 1538528160, 1969520280, 2792029680
Offset: 1
Links
- Vincenzo Librandi, Table of n, a(n) for n = 1..200
Programs
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Magma
[(NthPrime((n))^5 - NthPrime((n)))/2: n in [1..30] ]; // Vincenzo Librandi, Jun 18 2011
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Mathematica
a = {}; Do[p = Prime[n]; AppendTo[a, (p^5 - p)/2], {n, 1, 50}]; a (#^5-#)/2&/@Prime[Range[30]] (* Harvey P. Dale, Oct 01 2017 *) -
PARI
forprime(p=2,1e3,print1((p^5-p)/2", ")) \\ Charles R Greathouse IV, Jul 15 2011
Formula
a(n) = A138404(n)/2. - R. J. Mathar, Oct 15 2017