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Search: id:A109726
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| A109726 |
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Divide primes in groups with 2n elements and add together. |
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+0
5
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| 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; listen)
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OFFSET
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0,2
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FORMULA
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a(n) = A007504(n*(n+1)) - A007504(n*(n-1)).
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MATHEMATICA
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f[n_] := Sum[Prime[k], {k, n}]; Table[f[n*(n + 1)] - f[n*(n - 1)], {n, 0, 34}]
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CROSSREFS
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Cf. A007504, A109722-A109725.
Sequence in context: A027765 A096945 A063417 this_sequence A048535 A015547 A067376
Adjacent sequences: A109723 A109724 A109725 this_sequence A109727 A109728 A109729
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KEYWORD
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easy,nonn
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AUTHOR
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Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Aug 10 2005
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EXTENSIONS
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Edited and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Aug 11 2005
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