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Search: id:A115209
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| A115209 |
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a(0)=1. a(n) = number of earlier terms of the sequence which when added to n produce a composite number. |
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+0
4
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| 1, 0, 0, 1, 2, 2, 4, 4, 8, 4, 8, 5, 9, 8, 12, 7, 13, 12, 14, 12, 19, 16, 17, 17, 18, 17, 22, 20, 23, 17, 21, 24, 29, 25, 29, 25, 25, 29, 31, 28, 33, 32, 27, 34, 34, 34, 36, 37, 40, 36, 39, 41, 43, 43, 38, 42, 47, 47, 46, 44, 45, 48, 49, 48, 51, 49, 49, 49, 59, 54, 58, 55, 54, 59
(list; graph; listen)
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OFFSET
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0,5
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LINKS
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Diana Mecum, Table of n, a(n) for n = 0..200
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EXAMPLE
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Adding 6 to the first 6 terms (terms 0 through 5) of the sequence gives [7,6,6,7,8,8]. Of these terms, four are composite, so a(6) = 4.
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MATHEMATICA
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a = {1}; For[n = 1, n < 90, n++, in = 0; For[j = 1, j < Length[a] + 1, j++, If[ ! PrimeQ[n + a[[j]]], in++ ]]; AppendTo[a, in]]; a - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Jun 03 2007
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CROSSREFS
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Cf. A115207, A115208, A115210.
Sequence in context: A034396 A032190 A005852 this_sequence A139210 A008330 A138219
Adjacent sequences: A115206 A115207 A115208 this_sequence A115210 A115211 A115212
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), Jan 16 2006
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EXTENSIONS
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More terms from Stefan Steinerberger (stefan.steinerberger(AT)gmail.com) and Diana Mecum (diana.mecum(AT)gmail.com), Jun 03 2007
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