|
Search: id:A129623
|
|
|
| A129623 |
|
Numbers which are the product of a nonpalindrome and its reversal, where leading zeros are not allowed. |
|
+0
1
|
|
| 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; listen)
|
|
|
OFFSET
|
0,1
|
|
|
COMMENT
|
The smallest square in this sequence is 63504 = 252*252 = 144*441.
|
|
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: A066695 A104396 A072443 this_sequence A062904 A032800 A024749
Adjacent sequences: A129620 A129621 A129622 this_sequence A129624 A129625 A129626
|
|
KEYWORD
|
base,nonn
|
|
AUTHOR
|
Tanya Khovanova (tanyakh(AT)yahoo.com), May 30 2007
|
|
|
Search completed in 0.002 seconds
|
