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:^10base..[10base{.{+}*+(:x^<\}do;x^=9^<&@*]?0>
Input as an integer on top of the stack. Output is 0 (false) or 1 (true). Online demoOnline demo which lists the Keith numbers up to 100.
:^10base{.{+}*+(:x^<}do;x^=9^<&
Input as an integer on top of the stack. Output is 0 (false) or 1 (true). Online demo which lists the Keith numbers up to 100.
..[10base{.{+}*+(\}@*]?0>
