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Search: id:A013916
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| A013916 |
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Numbers n such that the sum of the first n primes is prime. |
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+0
15
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| 1, 2, 4, 6, 12, 14, 60, 64, 96, 100, 102, 108, 114, 122, 124, 130, 132, 146, 152, 158, 162, 178, 192, 198, 204, 206, 208, 214, 216, 296, 308, 326, 328, 330, 332, 334, 342, 350, 356, 358, 426, 446, 458, 460, 464, 480, 484, 488, 512, 530, 536, 548, 568, 620, 630, 676, 680
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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David W. Wilson, Table of n, a(n) for n = 1..10000
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FORMULA
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a(n) = A000720(A013917(n))
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MAPLE
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p:=proc(n) if isprime(sum(ithprime(k), k=1..n))=true then n else fi end: seq(p(n), n=1..690); (Deutsch)
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MATHEMATICA
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s = 0; Do[s = s + Prime[n]; If[PrimeQ[s], Print[n]], {n, 1, 1000}]
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CROSSREFS
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Cf. A007504, A013917, A013918.
Sequence in context: A015636 A015663 A057830 this_sequence A141113 A050584 A019280
Adjacent sequences: A013913 A013914 A013915 this_sequence A013917 A013918 A013919
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KEYWORD
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nonn,nice
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AUTHOR
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njas, Renaud Lifchitz (100637.64(AT)CompuServe.COM)
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EXTENSIONS
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More terms from David W. Wilson (davidwwilson(AT)comcast.net)
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