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Search: id:A154783
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| 1, 6, 9, 20, 15, 30, 35, 40, 63, 70, 55, 108, 65, 70, 135, 112, 119, 162, 95, 140, 231, 198, 161, 312, 225, 182, 351, 196, 203, 450, 217, 352, 429, 238, 385, 540, 407, 418, 585, 440, 369, 798, 387, 396, 945, 414, 423, 720, 441, 650, 969, 676, 583, 1026, 825, 840
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Also, row sums of triangle in A154722. [From Omar E. Pol (info(AT)polprimos.com), Jan 16 2009]
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FORMULA
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a(n) = A154784(n)+n.
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MAPLE
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isA008578 := proc(n) RETURN(n=1 or isprime(n)) ; end: A154783 := proc(n) local a, d; a := n ; for d from 1 to n-1 do if isA008578(n-d) and isA008578(n+d) then a := a+2*n; fi; od: a ; end: for n from 1 to 80 do printf("%d, ", A154783(n)) ; od: [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 18 2009]
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CROSSREFS
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Cf. A154720, A154721, A154784, A154785, A154786.
Cf. A154722. [From Omar E. Pol (info(AT)polprimos.com), Jan 16 2009]
Sequence in context: A103186 A011988 A161782 this_sequence A096546 A165717 A043103
Adjacent sequences: A154780 A154781 A154782 this_sequence A154784 A154785 A154786
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KEYWORD
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easy,nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Jan 15 2009
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EXTENSIONS
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Extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 18 2009
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