

A158642


Palindromic numbers which are the product of a number n and its reversal (n written backwards)


2



0, 1, 4, 9, 121, 252, 484, 10201, 12321, 14641, 20502, 23632, 26962, 40804, 44944, 1002001, 1113111, 1226221, 1234321, 1357531, 2005002, 2126212, 2216122, 2249422, 2347432, 2429242, 4008004, 4229224, 100020001
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

0,3


COMMENTS

Apart from 3 which produces 9 (3*3), all the other numbers n which satisfy the definition are formed by digits 0, 1 and 2 only. Subset of A002113.
Every term has an odd number of digits.  Floris van Doorn, Sep 25 2009


LINKS

Floris P. van Doorn, Table of n, a(n) for n=0,...,10126 (every term with at most 27 digits)


EXAMPLE

0*0=0; 1*1=1; 2*2=4; 3*3=9; 11*11=121; 12*21=252; 22*22=484; 101*101=10201; 102*201=20502; etc.


CROSSREFS

Cf. A002113
Sequence in context: A115676 A115667 A229971 * A131760 A002779 A028817
Adjacent sequences: A158639 A158640 A158641 * A158643 A158644 A158645


KEYWORD

easy,nonn,base


AUTHOR

Paolo P. Lava and Giorgio Balzarotti, Mar 23 2009


EXTENSIONS

Corrected by Floris P. van Doorn, Sep 25 2009


STATUS

approved



