A138425 a(n) = (prime(n)^5 - prime(n))/3.
10, 80, 1040, 5600, 53680, 123760, 473280, 825360, 2145440, 6837040, 9543040, 23114640, 38618720, 49002800, 76448320, 139398480, 238308080, 281532080, 450041680, 601409760, 691023840, 1025685440, 1313013520, 1861353120
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)))/3: n in [1..30] ]; // Vincenzo Librandi, Jun 18 2011
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Mathematica
a = {}; Do[p = Prime[n]; AppendTo[a, (p^5 - p)/3], {n, 1, 50}]; a -
PARI
forprime(p=2,1e3,print1((p^5-p)/3", ")) \\ Charles R Greathouse IV, Jul 15 2011
Formula
a(n) = A138404(n)/3. - R. J. Mathar, Oct 15 2017