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Line 3,896: It could look something like the following (ignoring whatever optimizations the other examples are using), if it was fast enough. I did not have the time/processor to test finding the first 5. The .israre() function appears to return the right answer, tested with individual numbers. ~~{{works with\|langur\|0.8.11}}~~ <syntaxhighlight lang="langur">val .perfectsquare = f isInteger .n ^/ 2 Line 3,917 ⟶ 3,916: # if you have the time... writeln "the first 5 rare numbers: ", .findfirst(5)</syntaxhighlight> ~~With 0.8.11, the built-in reverse() function will flip the digits of a number. Without this, you could write your own function to do so as follows (if not passed any negative numbers).~~ ~~<syntaxhighlight lang="langur">val .reverse = f toNumber join reverse split .n</syntaxhighlight>~~ =={{header\|Lua}}==

Rare numbers (view source)