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A165145 Partial sums of A058183. 0
1, 3, 6, 10, 15, 21, 28, 36, 45, 56, 69, 84, 101, 120, 141, 164, 189, 216, 245, 276, 309, 344, 381, 420, 461, 504, 549, 596, 645, 696, 749, 804, 861, 920, 981, 1044, 1109, 1176, 1245, 1316, 1389, 1464, 1541, 1620, 1701, 1784, 1869, 1956, 2045, 2136, 2229, 2324, 2421 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Number of digits of the concatenated first n entries of A007908.

LINKS

Table of n, a(n) for n=1..53.

EXAMPLE

Example: The 4th number is 10, because the number of digits in the concatenation 1121231234 is 10.

MATHEMATICA

t=Table[n*(n+1)/2, {n, 53}]; q=9; Add12[l_]:=Table[l[[n+q]]+l[[n]], {n, Length[l]-q}]; Join[Take[t, 9], Add12[t]] (* Vladimir Joseph Stephan Orlovsky, Feb 01 2012 *)

PROG

(Other) Visual Basic: Function Number(ByVal n As Long) Dim i As Long, b() ReDim b(n) For i = 1 To n b(i) = b(i - 1) + Len(CStr(i)) Number = Number + b(i) Next End Function

CROSSREFS

Sequence in context: A025746 A119663 A025715 * A046489 A277209 A089717

Adjacent sequences:  A165142 A165143 A165144 * A165146 A165147 A165148

KEYWORD

easy,base,nonn

AUTHOR

Zhining Yang, Sep 05 2009

EXTENSIONS

Edited and extended by R. J. Mathar, Sep 06 2009

STATUS

approved

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Last modified February 23 18:53 EST 2018. Contains 299586 sequences. (Running on oeis4.)