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Search: id:A130419
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| A130419 |
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Triangle (of n terms per row) where t(n,m) = the m-th positive integer which is coprime to n!!. (n!! = n*(n-2)*(n-4)..*(2 or 1).). |
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3
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| 1, 1, 3, 1, 2, 4, 1, 3, 5, 7, 1, 2, 4, 7, 8, 1, 5, 7, 11, 13, 17, 1, 2, 4, 8, 11, 13, 16, 1, 5, 7, 11, 13, 17, 19, 23, 1, 2, 4, 8, 11, 13, 16, 17, 19, 1, 7, 11, 13, 17, 19, 23, 29, 31, 37, 1, 2, 4, 8, 13, 16, 17, 19, 23, 26, 29, 1, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 1, 2, 4, 8, 16, 17
(list; table; graph; listen)
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OFFSET
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1,3
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MAPLE
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A130419 := proc(n, m) local ndf, mprime, a ; ndf := doublefactorial(n) ; a := 0 ; for mprime from 1 to m do a := a+1 ; while gcd(a, ndf) <> 1 do a := a+1 ; od ; od ; RETURN(a) ; end: for n from 1 to 15 do for m from 1 to n do printf("%d, ", A130419(n, m)) ; od ; od ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 06 2007
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CROSSREFS
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Cf. A130420, A130418.
Sequence in context: A016468 A134839 A077581 this_sequence A083110 A059016 A080418
Adjacent sequences: A130416 A130417 A130418 this_sequence A130420 A130421 A130422
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KEYWORD
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nonn,tabl
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), May 25 2007
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 06 2007
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