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Search: id:A067121
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| A067121 |
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a(n) = floor[X/Y] where X = concatenation of first n even numbers in increasing order and Y = their sum. |
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+0
3
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| 1, 4, 20, 123, 8227, 587643, 44073235, 3427918353, 274233468240, 22437283765107, 1869773647092288, 158211616292424373, 13560995682207803419, 1175286292458009629726, 102837550590075842601095
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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a(4): floor[2468/(2+4+6+8)] = floor[123.4] = 123.
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MAPLE
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for i from 1 to 33 do n := 2*i:s := n:c := n:n := n-2:while(n>0) do s := s+n:g := floor(log(c+1)/log(10)):c := c+10^(g+1)*n:n := n-2:end do:a[i] := floor(c/s):end do:q := seq(a[j], j=1..33);
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CROSSREFS
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Cf. A067112-A067120.
Sequence in context: A009351 A121553 A067116 this_sequence A002793 A162509 A151341
Adjacent sequences: A067118 A067119 A067120 this_sequence A067122 A067123 A067124
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KEYWORD
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easy,nonn,base
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jan 08 2002
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EXTENSIONS
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More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Mar 23 2002
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