A177114 4*(10^n-9).

4, 364, 3964, 39964, 399964, 3999964, 39999964, 399999964, 3999999964, 39999999964, 399999999964, 3999999999964, 39999999999964, 399999999999964, 3999999999999964, 39999999999999964, 399999999999999964

Offset: 1

Author

Vincenzo Librandi

Keywords

• nonn
• easy

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..999
• Index entries for linear recurrences with constant coefficients, signature (11,-10).

Programs

Mathematica

LinearRecurrence[{11, -10}, {4, 364}, 30] (* or *) Join[{4},Table[ 100*FromDigits[PadRight[{3},n,9]]+64,{n,30}]] (* Harvey P. Dale, Jul 31 2017 *)

Formula

G.f. 4*x*(1+80*x) / ( (10*x-1)*(x-1) ). - R. J. Mathar, Aug 24 2011

a(n) = 4*A170955(n). - R. J. Mathar, Aug 24 2011