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A109722
Sum of first 2n primes.
6
0, 5, 17, 41, 77, 129, 197, 281, 381, 501, 639, 791, 963, 1161, 1371, 1593, 1851, 2127, 2427, 2747, 3087, 3447, 3831, 4227, 4661, 5117, 5589, 6081, 6601, 7141, 7699, 8275, 8893, 9523, 10191, 10887, 11599, 12339, 13101, 13887, 14697, 15537, 16401, 17283
OFFSET
0,2
COMMENTS
Bisection of A007504.
FORMULA
a(n) = A007504(2n).
MATHEMATICA
f[n_] := Sum[Prime[k], {k, n}]; Table[f[2n], {n, 0, 43}]
Join[{0}, With[{nn=100}, Take[Accumulate[Prime[Range[nn]]], {2, nn, 2}]]] (* Harvey P. Dale, Dec 20 2021 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Giovanni Teofilatto, Aug 10 2005
EXTENSIONS
Edited and extended by Ray Chandler, Aug 11 2005
STATUS
approved