Skip to main content
Search type Search syntax
Tags [tag]
Exact "words here"
Author user:1234
user:me (yours)
Score score:3 (3+)
score:0 (none)
Answers answers:3 (3+)
answers:0 (none)
isaccepted:yes
hasaccepted:no
inquestion:1234
Views views:250
Code code:"if (foo != bar)"
Sections title:apples
body:"apples oranges"
URL url:"*.example.com"
Saves in:saves
Status closed:yes
duplicate:no
migrated:no
wiki:no
Types is:question
is:answer
Exclude -[tag]
-apples
For more details on advanced search visit our help page
Results tagged with
Search options not deleted user 18653

Palindromes are words, phrases, representations of numbers or times which read the same in reverse, for example "level", "reviver", "12321", "10:01". See also the [balanced-string] tag.

1 vote

Numbers that can be negated by reading backwards

Perl 5, 134 bytes while(++$n){for$c("",0){$_="T"x$n;s/T/1/;do{($b=reverse)=~y/1T/T1/;print"$_$c$b$/"}while(/(?=[T0]1*$)/g&&substr($_,pos)=~y/T01/01T/)}} Like some other answers, it uses string manip …
aschepler's user avatar
  • 937