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A076793
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Sum_{k=1..n} 2^prime(k).
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3
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0, 4, 12, 44, 172, 2220, 10412, 141484, 665772, 9054380, 545925292, 2693408940, 140132362412, 2339155617964, 11135248640172, 151872736995500, 9159071991736492, 585619824295159980, 2891462833508853932
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| a(n) = a(n-1) + 2^prime(n).
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EXAMPLE
| E.g. a(1) = 2^prime(1) = 2^2 = 4; a(2) = 4 + 2^prime(2) = 4 + 2^3 = 12
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CROSSREFS
| Cf. A076794.
Sequence in context: A055542 A149365 A000759 * A007860 A039740 A065143
Adjacent sequences: A076790 A076791 A076792 * A076794 A076795 A076796
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KEYWORD
| easy,nonn
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AUTHOR
| Walter G. Carlini (541carlini(AT)charter.net), Nov 17 2002
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EXTENSIONS
| More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 31 2007
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