A084011 Digit reversal of 11*n, divided by 11.

1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 11, 21, 31, 41, 51, 61, 71, 81, 82, 2, 12, 22, 32, 42, 52, 62, 72, 73, 83, 3, 13, 23, 33, 43, 53, 63, 64, 74, 84, 4, 14, 24, 34, 44, 54, 55, 65, 75, 85, 5, 15, 25, 35, 45, 46, 56, 66, 76, 86, 6, 16, 26, 36, 37, 47, 57, 67, 77, 87, 7, 17, 27, 28, 38, 48, 58

Offset: 1

Author

Amarnath Murthy, May 23 2003

Keywords

• base
• nonn

Examples

			For n = 13, A004086(13*11)/11 = 341/11 = 31. So, a(13) = 31. - _Indranil Ghosh_, Jan 10 2017
		

Links

• Indranil Ghosh, Table of n, a(n) for n = 1..9999

Crossrefs

Cf. A004086, A007091.

Cf. A039691 (n such that a(n) = A004086(n)).

Programs

Mathematica

a[n_] := Module[{aux = IntegerDigits[11*n]},Sum[aux[[i]]*10^(i - 1), {i, 1, Length[aux]}]/11]; Table[a[n], {n, 100}] (* José María Grau Ribas, Feb 16 2010 *)

Python

def A084011(n):
     return int(str(11*n)[::-1])/11 # Indranil Ghosh, Jan 10 2017

Formula

a(n) = A004086(11*n)/11. - Indranil Ghosh, Jan 10 2017