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A032607 Concatenation of n and n + 2 or {n,n+2}. 2
13, 24, 35, 46, 57, 68, 79, 810, 911, 1012, 1113, 1214, 1315, 1416, 1517, 1618, 1719, 1820, 1921, 2022, 2123, 2224, 2325, 2426, 2527, 2628, 2729, 2830, 2931, 3032, 3133, 3234, 3335, 3436, 3537, 3638, 3739, 3840, 3941, 4042, 4143, 4244 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..42.

FORMULA

a(n)=n*floor(log10(n+2)+1)+n+2, with n>=1 [From Paolo P. Lava, Oct 09 2008]

MATHEMATICA

Table[FromDigits[Flatten[IntegerDigits/@{n, n+2}]], {n, 50}] (* Harvey P. Dale, Dec 18 2013 *)

CROSSREFS

Cf. A001704, A020338.

Sequence in context: A104342 A119590 A266912 * A190040 A081723 A189325

Adjacent sequences:  A032604 A032605 A032606 * A032608 A032609 A032610

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, May 15 1998

STATUS

approved

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Last modified August 17 23:58 EDT 2017. Contains 290682 sequences.