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A110722
{n concatenate R(n)}*{ R(n) concatenate n}, where R(n) = digit reversal of n.
6
0, 121, 484, 1089, 1936, 3025, 4356, 5929, 7744, 9801, 110110, 1234321, 2578752, 4143403, 5928274, 7933365, 10158676, 12604207, 15269958, 18155929, 440440, 2578752, 4937284, 7516036, 10315008, 13334200, 16573612, 20033244, 23713096
OFFSET
0,2
COMMENTS
a(n) == 0 (mod 11)
LINKS
FORMULA
When n has one digit a(n)=(11n)^2. When n has two digits a(n)= 110110*x^2 + 1014101*x*y + 110110*y^2. (Here x,y are the digits of n.). - _Keith Schneider_, Jun 16 2007
EXAMPLE
a(13) = 1331*3113 = 4143403.
MATHEMATICA
Table[FromDigits[Join[IntegerDigits[n], Reverse[IntegerDigits[n]]]]* FromDigits[Join[Reverse[IntegerDigits[n]], IntegerDigits[n]]], {n, 0, 50}] (* G. C. Greubel, sep 06 2017 *)
CROSSREFS
Sequence in context: A052082 A062555 A017390 * A236181 A077432 A017654
KEYWORD
base,easy,nonn
AUTHOR
Amarnath Murthy, Aug 09 2005
EXTENSIONS
More terms from Maire B. O'Neill (mbo5001(AT)psu.edu), Sep 18 2005
Corrected by James Greene (jmg482(AT)psu.edu), Apr 07 2006
STATUS
approved