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Search: id:A037182
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| 0, 45, 4950, 499500, 49995000, 4999950000, 499999500000, 49999995000000, 4999999950000000, 499999999500000000, 49999999995000000000, 4999999999950000000000, 499999999999500000000000
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Sum of all numbers with <= n digits.
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FORMULA
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Sum_{i=1..10^n-1} i = the (10^n-1)th triangular number (A000217). - Marvin Ray Burns (bmmmburns(AT)sbcglobal.net)
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MATHEMATICA
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f[n_] := 10^n(10^n - 1)/2; Table[ f[n], {n, 0, 12}] (from Robert G. Wilson v Dec 24 2004)
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CROSSREFS
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Partial sums of A101291.
Sequence in context: A093533 A101291 A061542 this_sequence A134229 A163035 A101994
Adjacent sequences: A037179 A037180 A037181 this_sequence A037183 A037184 A037185
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KEYWORD
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nonn,easy
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AUTHOR
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Marvin Ray Burns (bmmmburns(AT)sbcglobal.net)
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