RosettaCodeData/Task/Digital-root-Multiplicative.../PicoLisp/digital-root-multiplicative...

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(de mdr-mp (N)
"Returns the solutions in a list, i.e., '(MDR MP)"
(let MP 0
(while (< 1 (length N))
(setq N (apply * (mapcar format (chop N))))
(inc 'MP) )
(list N MP) ) )
# Get the MDR/MP of these nums.
(setq Test-nums '(123321 7739 893 899998))
(let Fmt (6 5 5)
(tab Fmt "Values" "MDR" "MP")
(tab Fmt "======" "===" "==")
(for I Test-nums
(let MDR-MP (mdr-mp I)
(tab Fmt I (car MDR-MP) (cadr MDR-MP)) ) ) )
(prinl)
# Get the nums of these MDRs.
(setq *Want 5)
(setq *Solutions (make (for MDR (range 0 9)
(link (make (let N 0 (until (= *Want (length (made)))
(when (= MDR (car (mdr-mp N)))
(link N) )
(inc 'N) )))) )))
(let Fmt (3 1 -1)
(tab Fmt "MDR" ": " "Values")
(tab Fmt "===" " " "======")
(for (I . S) *Solutions
(tab Fmt (dec I) ": " (glue ", " S)) ) )