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

1,2

Links

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

Formula

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

Example

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

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 *)

Prog

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

Crossrefs

Cf. A004086, A007091.

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

Sequence in context: A343750 A107603 A161594 * A345110 A004086 A121760

Adjacent sequences: A084008 A084009 A084010 * A084012 A084013 A084014

Keyword

base,nonn

Author

Amarnath Murthy, May 23 2003

Status

approved