[ unclip 1 head prefix concat ] map [ all-unique? ] filter ;
: add-missing-digit ( seq -- seq )
- dup natural-sort 10 iota swap diff prepend ;
+ dup natural-sort 10 <iota> swap diff prepend ;
: interesting-pandigitals ( -- seq )
17 candidates { 13 11 7 5 3 2 } [