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Search: id:A091792
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| A091792 |
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Concatenation of first n terms of A091791 divided by (2n-1). |
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+0
2
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| 1, 4, 243, 17360, 1350225, 11047296, 934771207, 81013504612, 7148250406947, 6395802995689430, 578667890086186528, 52834894312217030820, 48608102767239668354413, 45007502562258952180012050
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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a(1) = 1, a(2) = 12/3 = 4, a(3) = 1215/5 = 243.
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MAPLE
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A055642 := proc(n) ilog10(n)+ 1; end: Lcat := proc(L) local resul, i ; resul := op(1, L) ; for i from 2 to nops(L) do resul := resul*10^A055642(op(i, L))+op(i, L) ; od ; RETURN(resul) ; end: A091792 := proc(nmax) local a91, a, k, n ; a91 := [1] ; a := [1] ; for n from 2 to nmax do k :=1 ; while Lcat([op(a91), k*n]) mod (2*n-1) <> 0 do k := k+1 ; od ; a91 := [op(a91), k*n] ; a := [op(a), Lcat(a91)/(2*n-1)] ; od; a ; end: A091792(40); - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 20 2007
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CROSSREFS
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Cf. A091791.
Sequence in context: A137342 A152793 A042769 this_sequence A090602 A087587 A063073
Adjacent sequences: A091789 A091790 A091791 this_sequence A091793 A091794 A091795
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 18 2004
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 20 2007
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