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A001704
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a(n) = concatenation {n,n+1}.
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11
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12, 23, 34, 45, 56, 67, 78, 89, 910, 1011, 1112, 1213, 1314, 1415, 1516, 1617, 1718, 1819, 1920, 2021, 2122, 2223, 2324, 2425, 2526, 2627, 2728, 2829, 2930, 3031, 3132, 3233, 3334, 3435, 3536, 3637, 3738, 3839, 3940, 4041, 4142, 4243, 4344, 4445, 4546
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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FORMULA
| a(n)=n*10^{1+floor[log(n+1)]}+n+1, with n>=1 - Paolo P. Lava (paoloplava(AT)gmail.com), May 09 2008
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MAPLE
| P:=proc(n) local a, i; for i from 1 by 1 to n do a:=i*10^(1+floor(evalf(log10(i+1), 10)))+i+1; print(a); od; end: P(100); - Paolo P. Lava (paoloplava(AT)gmail.com), May 09 2008
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CROSSREFS
| See A127421 for another version.
Sequence in context: A072485 A035333 * A127421 A112131 A088997 A049852
Adjacent sequences: A001701 A001702 A001703 * A001705 A001706 A001707
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KEYWORD
| nonn,base,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from Joshua Zucker (joshua.zucker(AT)stanfordalumni.org) and Jon E. Schoenfield (jonscho(AT)hiwaay.net), May 15 2007
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