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A050247
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a(n) is the sum of the first A045345(n) primes.
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4
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2, 874, 5830, 2615298, 712377380, 86810649294, 794712005370, 105784534314378, 92542301212047102, 82704567079549985700, 24733255676526572596026, 3612032130800990065125528
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| a(10) and a(11) were found by Giovanni Resta (Nov 15 2004). He states that there are no other terms for primes p < 4011201392413. See link to Prime Puzzles, Puzzle 31 below.
a(13) > 6640510710493148698166596 (sum of first pi(2*10^13) primes). [From Donovan Johnson (donovan.johnson(AT)yahoo.com), Aug 23 2010]
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LINKS
| Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
The Prime Puzzles & Problems Connection: Puzzle 31.- The Average Prime number, APN(k) = S(Pk)/k.
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FORMULA
| a(n) = sum_{i=1..A045345(n)} A000040(i). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 26 2008
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CROSSREFS
| Cf. A045345, A050248.
Sequence in context: A141185 A128667 A199947 * A159705 A203609 A159723
Adjacent sequences: A050244 A050245 A050246 * A050248 A050249 A050250
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KEYWORD
| nonn,more
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AUTHOR
| Eric Weisstein (eric(AT)weisstein.com)
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EXTENSIONS
| a(10), a(11) from Giovanni Resta submitted by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jul 19 2010
a(12) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Aug 23 2010
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