A115298 Row sums of A115297.

1, 3, 7, 13, 21, 31, 43, 55, 73, 91, 115, 139, 165, 193, 227, 263, 301, 339, 381, 423, 471, 517, 569, 625, 685, 745, 809, 871, 937, 1011, 1089, 1167, 1247, 1335, 1425, 1515, 1611, 1707, 1809, 1915, 2023, 2135, 2249, 2363, 2479, 2601, 2735, 2865, 2997, 3129

Offset

1,2

Links

Muniru A Asiru, Table of n, a(n) for n = 1..3000

Formula

a(n) = Sum_{k=2..n+1} (A000040(k) - A000040(ceiling(k/2))). - Jon Maiga, Jan 04 2019

Maple

a:=n->add(ithprime(k)-ithprime(ceil(k/2)), k=2..n+1): seq(a(n), n=1..60); # Muniru A Asiru, Jan 04 2019

Mathematica

Accumulate[Table[Prime[n] - Prime[Ceiling[n/2]], {n, 2, 51}]] (* Jon Maiga, Jan 04 2019 *)

Crossrefs

Cf. A115297, A000040, A000166, A008276.

Sequence in context: A195020 A169627 A102508 * A161206 A025728 A084537

Adjacent sequences: A115295 A115296 A115297 * A115299 A115300 A115301

Keyword

easy,nonn

Author

André F. Labossière, Jan 19 2006

Extensions

More terms from André F. Labossière, Mar 27 2006

Status

approved