num_plus_sep

 

#!/bin/bash

shopt -s extglob

rmzero(){ b=${i:1}; b=${b/*(0)/}; [[ ! ${b} ]] && b=0; ((j=i-b)); }
run.unique()
{
   (( ! ${#mox[@]} )) && return
   local t mid
   declare -A mid
   for((t=0; t!=${#mox[@]}; ++t)); do
        mid[${mox[t]}]=${mox[t]}
   done
   echo ${i} : ${mid[@]}
}

per.sum()
{
   i=10
   rmzero
   for((k=0; i!=${1}+1; ++k)); do
        s=${j/${j:k:1}/}
        p=${s/*(0)/}
        (( j+p == i )) &&((mox[${#mox[@]}]=j))
        (( k+1 == ${#j} )) && { k=-1; ((++j)); }
        (( j == i )) && { k=-1; run.unique; ((++i)); rmzero; mox=(); }
   done
}

per.sum ${1:-50}

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