A110724 - OEIS

A110724

{n concatenate R(n)} + {R(n) concatenate n}, where R(n) = digit reversal of n.

0, 22, 44, 66, 88, 110, 132, 154, 176, 198, 1111, 2222, 3333, 4444, 5555, 6666, 7777, 8888, 9999, 11110, 2222, 3333, 4444, 5555, 6666, 7777, 8888, 9999, 11110, 12221, 3333, 4444, 5555, 6666, 7777, 8888, 9999, 11110, 12221, 13332, 4444, 5555, 6666

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OFFSET

0,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..1000

FORMULA

When n has one digit, a(n)=22*n. When n has two digits, a(n)= 1111*x + 1111*y. (Here x,y are the digits of n.) - Keith Schneider, Jun 16 2007

EXAMPLE

a(12) = 1221 + 2112 = 3333.

a(68) = 6886 + 8668 = 15554.

MATHEMATICA

Table[FromDigits[Join[IntegerDigits[n], Reverse[IntegerDigits[n]]]] + FromDigits[Join[Reverse[IntegerDigits[n]], IntegerDigits[n]]], {n, 0, 50}] (* Stefan Steinerberger, Jun 17 2007 *)

CROSSREFS

Cf. A110722, A110723, A110725.

Sequence in context: A269310 A015799 A008604 * A277051 A308125 A061832

Adjacent sequences: A110721 A110722 A110723 * A110725 A110726 A110727

KEYWORD

base,easy,nonn,less

AUTHOR

Amarnath Murthy, Aug 09 2005

EXTENSIONS

Corrected and extended by Stefan Steinerberger, Jun 17 2007

STATUS

approved