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A109726 Divide primes in groups with 2n elements and add together. 6
0, 5, 36, 156, 442, 954, 1854, 3154, 4998, 7514, 10784, 14786, 19932, 26148, 33448, 42340, 52208, 64322, 77898, 93116, 110224, 129978, 151990, 175224, 201584, 231272, 263500, 298590, 335856, 376616, 420984, 469894, 521740, 577304, 634990 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

First difference of A322420.

LINKS

Ray Chandler, Table of n, a(n) for n = 0..10000

FORMULA

a(n) = A007504(n*(n+1)) - A007504(n*(n-1)).

MATHEMATICA

f[n_] := Sum[Prime[k], {k, n}]; Table[f[n*(n + 1)] - f[n*(n - 1)], {n, 0, 34}]

CROSSREFS

Cf. A007504, A109722-A109725, A322420.

Sequence in context: A196481 A096945 A063417 * A272561 A266097 A196714

Adjacent sequences:  A109723 A109724 A109725 * A109727 A109728 A109729

KEYWORD

easy,nonn

AUTHOR

Giovanni Teofilatto, Aug 10 2005

EXTENSIONS

Edited and extended by Ray Chandler, Aug 11 2005

STATUS

approved

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Last modified October 15 20:04 EDT 2019. Contains 328037 sequences. (Running on oeis4.)