|
| |
|
|
A178889
|
|
Numbers n such that R(n) (n-reversed) appears to the left of n in the string 12345678910111213....
|
|
0
|
|
|
|
19, 21, 29, 31, 32, 39, 41, 42, 43, 49, 51, 52, 53, 54, 59, 61, 62, 63, 64, 65, 69, 71, 72, 73, 74, 75, 76, 79, 81, 82, 83, 84, 85, 86, 87, 89, 91, 92, 93, 94, 95, 96, 97, 98, 99, 101, 110, 111, 119, 120, 121, 130, 131, 140, 141, 150, 151, 160, 161, 170, 171, 180, 181
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
COMMENTS
|
Consider the infinite string of digits A007908(row->infinity). Whenever the digit-reversed variant of n, R(n) = A004086(n), appears ahead of n in that string, adjoin n to the current sequence.
|
|
|
LINKS
|
|
|
|
EXAMPLE
|
19 is generated where 9 meets 10, 12345678(91)01112131415161718(19)20...
21 is generated by 1 and 2: (12)34567891011121314151617181920(21)22...
29 is generated where 19 joins 20: 1234567891011121314151617181(92)02122232425262728(29)30...
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
nonn,base,easy
|
|
|
AUTHOR
|
|
|
|
EXTENSIONS
|
Definition shortened, examples detailed, keyword:base added by R. J. Mathar, Jul 13 2010
|
|
|
STATUS
|
approved
|
| |
|
|
