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A110724
{n concatenate R(n)} + {R(n) concatenate n}, where R(n) = digit reversal of n.
4
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
OFFSET
0,2
LINKS
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
KEYWORD
base,easy,nonn,less
AUTHOR
Amarnath Murthy, Aug 09 2005
EXTENSIONS
Corrected and extended by Stefan Steinerberger, Jun 17 2007
STATUS
approved