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Search: id:A038396
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| A038396 |
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Concatenate first n even numbers in reverse order. |
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+0
1
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| 2, 42, 642, 8642, 108642, 12108642, 1412108642, 161412108642, 18161412108642, 2018161412108642, 222018161412108642, 24222018161412108642, 2624222018161412108642
(list; graph; listen)
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OFFSET
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0,1
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REFERENCES
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M. Bencze, L.Tutescu, Some Notions and Questions in Number Theory, Sequence 4.
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LINKS
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M. L. Perez et al., eds., Smarandache Notions Journal
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FORMULA
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a(n)=(2*n)*10^floor{1+log10[a(n-1)]}+a(n-1), with a(1)=2 - Paolo P. Lava (ppl(AT)spl.at), Jun 19 2008
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MAPLE
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P:=proc(i) local a, n; a:=2; print(a); for n from 2 by 1 to i do a:=2*n*10^floor(evalf(1+log10(a), 100))+a ; print(a); od; end: P(100); - Paolo P. Lava (ppl(AT)spl.at), Jun 19 2008
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CROSSREFS
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Sequence in context: A070808 A157056 A140170 this_sequence A162678 A124103 A152286
Adjacent sequences: A038393 A038394 A038395 this_sequence A038397 A038398 A038399
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KEYWORD
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nonn,base
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AUTHOR
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M.I.Petrescu (mipetrescu(AT)yahoo.com)
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