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  1. @Mathematica
  2.  
  3. romanNumeralMax[n_]:=Module[{romanNumeral,lst,maxlength},
  4.  
  5. 	(* Function *)
  6. 	romanNumeral[nx_]:=Module[{nToRoman,nnToRoman,nnnToRoman,nnnnToRoman},
  7.  
  8. 		nToRoman[mx_]:=mx//
  9. 			Which[
  10. 				#==0,"",
  11. 				#==1,"I",
  12. 				#==2,"II",
  13. 				#==3,"III",
  14. 				#==4,"IV",
  15. 				#==5,"V",
  16. 				#==6,"VI",
  17. 				#==7,"VII",
  18. 				#==8,"VIII",
  19. 				#==9,"IX",
  20. 				True,""]&;
  21.  
  22. 		nnToRoman[mx_]:=mx//
  23. 			nToRoman//
  24. 			StringReplace[#,{"I"->"X","V"->"L","X"->"C"}]&;
  25.  
  26. 		nnnToRoman[mx_]:=mx//
  27. 			nToRoman//
  28. 			StringReplace[#,{"I"->"C","V"->"D","X"->"M"}]&;
  29.  
  30. 		nnnnToRoman[mx_]:=mx//
  31. 			nToRoman//
  32. 			StringReplace[#,{"I"->"M","V"->"*","X"->"*"}]&;
  33.  
  34. 		nx//
  35. 			IntegerDigits//
  36. 			PadLeft[#,4]&//
  37. 			{nnnnToRoman[#[[1]]],nnnToRoman[#[[2]]],nnToRoman[#[[3]]],nToRoman[#[[4]]]}&//
  38. 			StringJoin
  39. 	];
  40.  
  41. 	(* Data & Parameter *)
  42. 	lst=n//
  43. 		Range//
  44. 		Map[{#,romanNumeral[#]}&,#]&//
  45. 		Map[{#[[1]],StringLength[#[[2]]]}&,#]&;
  46.  
  47. 	maxlength=lst//
  48. 		Map[#[[2]]&,#]&//
  49. 		Max;
  50.  
  51. 	(* Results *)
  52. 	lst//
  53. 		Select[#,#[[2]]==maxlength&]&//
  54. 		Map[#[[1]]&,#]&
  55. ];
  56.  
  57.  
  58. In[1] := romanNumeralMax[1887]
  59. Out[1] = {888, 1388, 1788, 1838, 1878, 1883, 1887}
  60.  
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https://ideone.com/uEPG3P
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created:
7 years ago
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