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Search: id:A019520
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| A019520 |
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Concatenate even numbers. |
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+0
4
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| 2, 24, 246, 2468, 246810, 24681012, 2468101214, 246810121416, 24681012141618, 2468101214161820, 246810121416182022, 24681012141618202224, 2468101214161820222426, 246810121416182022242628
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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H. Ibstedt, A Few Smarandache Sequences, Smarandache Notions Journal, Vol. 8, No. 1-2-3, 1997, 170-183.
F. Smarandache, "Collected Papers", Vol. II, Tempus Publ. Hse., Buharest, Romania, 1996.
S. Smarandoiu, Convergence of Smarandache continued fractions, Abstract 96T-11-195, Abstracts Amer. Math. Soc., 17 (No. 4, 1996), 680.
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LINKS
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M. L. Perez et al., eds., Smarandache Notions Journal
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
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FORMULA
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a(n)=a(n-1)*10^floor(log10(2*n)+1)+2*n, with a(1)=2. [From Paolo P. Lava (ppl(AT)spl.at), Jan 21 2009]
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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:=a*10^floor(evalf((log10(2*n)+1), 100))+2*n; print(a); od; end: P(100); [From Paolo P. Lava (ppl(AT)spl.at), Jan 21 2009]
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CROSSREFS
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Sequence in context: A143407 A132596 A099669 this_sequence A061190 A002006 A065101
Adjacent sequences: A019517 A019518 A019519 this_sequence A019521 A019522 A019523
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KEYWORD
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base,nonn,easy
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AUTHOR
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R. Muller
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EXTENSIONS
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More terms from Erich Friedman (erich.friedman(AT)stetson.edu).
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