

A129623


Numbers which are the product of a nonpalindrome and its reversal, where leading zeros are not allowed.


0



252, 403, 574, 736, 765, 976, 1008, 1207, 1300, 1458, 1462, 1612, 1729, 1855, 1944, 2268, 2296, 2430, 2668, 2701, 2944, 3154, 3478, 3627, 3640, 4032, 4275, 4606, 4930, 5092, 5605, 5848, 6624, 6786, 7663, 8722, 20502, 23632, 26962, 30492, 31003, 34222
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

0,1


COMMENTS

The smallest square in this sequence is 63504 = 252*252 = 144*441.


LINKS

Table of n, a(n) for n=0..41.


EXAMPLE

252 = 12*21


MATHEMATICA

Take[Union[ Transpose[ Select[Table[{n, n* FromDigits[Reverse[IntegerDigits[n]]]}, {n, 1000}], Mod[ #[[1]], 10] != 0 && #[[1]] != FromDigits[Reverse[IntegerDigits[ #[[1]]]]] &]][[2]]], 100]


CROSSREFS

Cf. A072443 Nonsquares which are the product of two numbers with the same digits (leading zeros are forbidden). A076750 Squares which are the product of a nonpalindrome and its reversal, where leading zeros are not allowed.
Sequence in context: A104396 A207373 A072443 * A062904 A032800 A024749
Adjacent sequences: A129620 A129621 A129622 * A129624 A129625 A129626


KEYWORD

base,nonn


AUTHOR

Tanya Khovanova, May 30 2007


STATUS

approved



