A109910 a(n) = 9's complement of digit reversal of n.

9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 8, 88, 78, 68, 58, 48, 38, 28, 18, 8, 7, 87, 77, 67, 57, 47, 37, 27, 17, 7, 6, 86, 76, 66, 56, 46, 36, 26, 16, 6, 5, 85, 75, 65, 55, 45, 35, 25, 15, 5, 4, 84, 74, 64, 54, 44, 34, 24, 14, 4, 3, 83, 73, 63, 53, 43, 33, 23, 13, 3, 2

Offset

0,1

Links

Nathaniel Johnston, Table of n, a(n) for n = 0..10000

Formula

a(n) = A061601(A004086(n)). - Indranil Ghosh, Jan 30 2017

Example

a(17) = 28. Digit reversal of 17 = 71, 9's complement of 71 is 99-71 = 28.

Maple

R := proc(n) local nn, nnn: nn:=convert(n, base, 10): add(nn[nops(nn)+1-j]*10^(j-1), j=1..nops(nn)): end:
A109910 := proc(n) return 10^length(max(R(n), 1)) - R(n) - 1: end:
seq(A109910(n), n=0..70); # Nathaniel Johnston, Apr 28 2011

Mathematica

Table[10^If[# == 0, 1, IntegerLength@ #] - 1 - # &@ FromDigits@ Reverse@ IntegerDigits@ n, {n, 0, 70}] (* Michael De Vlieger, Feb 01 2017 *)

Prog

(Python)
def A109910(n):
....x=int(str(n)[::-1])
....return 10**len(str(x))-1-x # Indranil Ghosh, Jan 30 2017

Crossrefs

Cf. A004086, A061601, A109911.

Sequence in context: A199264 A022965 A023451 * A307340 A084019 A061601

Adjacent sequences: A109907 A109908 A109909 * A109911 A109912 A109913

Keyword

base,easy,nonn,look

Author

Amarnath Murthy, Jul 16 2005

Status

approved