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Search: id:A128927
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| A128927 |
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Primes which are the sum of the first k nonprimes for some k >= 2. |
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+0
1
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| 5, 11, 19, 79, 113, 251, 401, 709, 947, 1579, 1847, 2063, 5077, 7603, 9049, 10457, 11621, 17509, 18353, 19433, 21911, 22853, 24551, 27073, 30809, 33923, 34213, 37781, 39313, 39623, 45757, 46091, 47779, 51241, 53381, 56299, 58537, 67927
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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The k's are: 2, 3, 4, 9, 11, 17, 22, 30, 35, 46, 50, 53, 85, 105, 115, 124, ..., . - Robert G. Wilson v Apr 28 2007.
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EXAMPLE
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1+4+6+8+9+10+12+14+15+16+18=113, a prime. The subtotals were taken up to and including 4,6,8,18,26,33,44,50,64,69,74,115,138,150.
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MATHEMATICA
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lst = {}; s = 0; Do[ If[ !PrimeQ@ n, s = s + n; If[ PrimeQ@ s, AppendTo[lst, s]]], {n, 460}]; lst (* Robert G. Wilson v *)
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CROSSREFS
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Cf. A018252.
Sequence in context: A112794 A072743 A045452 this_sequence A033913 A088124 A029456
Adjacent sequences: A128924 A128925 A128926 this_sequence A128928 A128929 A128930
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KEYWORD
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nonn
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AUTHOR
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J. M. Bergot (thekingfishb(AT)yahoo.ca), Apr 25 2007
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EXTENSIONS
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Edited and extended by Robert G. Wilson v (rgwv(at)rgwv.com), Apr 28 2007
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