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A177096 5*(10^n-2). 0
40, 490, 4990, 49990, 499990, 4999990, 49999990, 499999990, 4999999990, 49999999990, 499999999990, 4999999999990, 49999999999990, 499999999999990, 4999999999999990, 49999999999999990, 499999999999999990 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
G.f. 10*x*(4+5*x) / ( (10*x-1)*(x-1) ). - R. J. Mathar, Jan 06 2011
CROSSREFS
Sequence in context: A115189 A186933 A271650 * A202902 A140045 A223162
KEYWORD
nonn,easy
AUTHOR
STATUS
approved

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Last modified February 23 14:24 EST 2024. Contains 370283 sequences. (Running on oeis4.)