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A037182
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10^n*(10^n-1) / 2.
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1
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0, 45, 4950, 499500, 49995000, 4999950000, 499999500000, 49999995000000, 4999999950000000, 499999999500000000, 49999999995000000000, 4999999999950000000000, 499999999999500000000000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Sum of all numbers with <= n digits.
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FORMULA
| 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
| 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
| Partial sums of A101291.
Sequence in context: A093533 A101291 A061542 * A178632 A134229 A199355
Adjacent sequences: A037179 A037180 A037181 * A037183 A037184 A037185
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KEYWORD
| nonn,easy
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AUTHOR
| Marvin Ray Burns (bmmmburns(AT)sbcglobal.net)
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