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Search: id:A135232
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| A135232 |
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Sum of the products of the first n prime pairs. |
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+0
2
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| 6, 41, 184, 507, 1174, 2321, 4084, 6575, 10174, 14931, 20698, 28085, 37882, 48903, 61220, 77857, 96900, 119399, 144990, 173881, 206280, 243143, 282346, 329399, 381382, 437069, 497560, 565151, 638050, 715887, 798806, 894283, 993504, 1105051
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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a(n) = sum(i=1..n) A089581(i). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 19 2008
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EXAMPLE
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The the sum of the products of the first 3 prime pairs is 2*3+5*7+11*13 = 184, the 3rd entry in the sequence.
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PROGRAM
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(PARI) g(n)=s=0; forstep(x=1, n*2, 2, s+=prime(x)*prime(x+1); print1(s, ", "))
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CROSSREFS
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Sequence in context: A096716 A000611 A043069 this_sequence A015551 A049685 A122371
Adjacent sequences: A135229 A135230 A135231 this_sequence A135233 A135234 A135235
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KEYWORD
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nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)hotmail.com), Feb 14 2008
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