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Search: id:A165145
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| 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; listen)
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OFFSET
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1,2
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COMMENT
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Number of digits of the concatenated first n entries of A007908.
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EXAMPLE
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Example: The 4th number is 10, because the number of digits in the concatenation 1121231234 is 10.
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PROGRAM
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(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
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CROSSREFS
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Sequence in context: A025746 A119663 A025715 this_sequence A046489 A089717 A050760
Adjacent sequences: A165142 A165143 A165144 this_sequence A165146 A165147 A165148
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KEYWORD
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easy,base,nonn
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AUTHOR
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Zhining Yang (northwolves(AT)163.com), Sep 05 2009
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EXTENSIONS
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Edited and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 06 2009
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