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A087330
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Sum of all digits of all integers less than or equal to 555...55 (with n 5's) in base 10.
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7
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0, 15, 370, 6150, 86430, 1114210, 13641990, 161419770, 1864197550, 21141975330, 236419753110, 2614197530890, 28641975308670, 311419753086450, 3364197530864230, 36141975308642010, 386419753086419790
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| From a suggestion of Yalcin Aktar (aktaryalcin(AT)msn.com)
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FORMULA
| a(n)=20/9*n-110/81*10^n+110/81+5/2*n*10^n (formula from B. Greco)
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EXAMPLE
| a(1)=15 since numbers less than or equal to 5 are 1,2,3,4,5 and the sum of digits is 1+2+3+4+5=15.
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CROSSREFS
| Sequence in context: A184132 A012486 A035020 * A035274 A145409 A164323
Adjacent sequences: A087327 A087328 A087329 * A087331 A087332 A087333
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KEYWORD
| base,nonn
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AUTHOR
| Benoit Cloitre (benoit7848c(AT)orange.fr), Oct 20 2003
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