

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
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

0,2


COMMENTS

a(n) == 0 (mod 11)


LINKS

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


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
Adjacent sequences: A110719 A110720 A110721 * A110723 A110724 A110725


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



