A177096 5*(10^n-2).

40, 490, 4990, 49990, 499990, 4999990, 49999990, 499999990, 4999999990, 49999999990, 499999999990, 4999999999990, 49999999999990, 499999999999990, 4999999999999990, 49999999999999990, 499999999999999990

Offset

1,1

Links

Table of n, a(n) for n=1..17.

Index entries for linear recurrences with constant coefficients, signature (11,-10).

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

Adjacent sequences: A177093 A177094 A177095 * A177097 A177098 A177099

Keyword

nonn,easy

Author

Vincenzo Librandi

Status

approved