A178968 Numbers that are represented in Roman numerals by exactly four letters.

8, 13, 17, 22, 24, 26, 29, 31, 35, 42, 44, 46, 49, 53, 57, 62, 64, 66, 69, 71, 75, 80, 92, 94, 96, 99, 103, 107, 112, 114, 116, 119, 121, 125, 130, 141, 145, 152, 154, 156, 159, 161, 165, 170, 191, 195, 202, 204, 206, 209, 211, 215, 220, 240, 251, 255, 260

Offset: 1

Author

Kyle Stern, Jan 01 2011

Keywords

• base
• easy
• nonn

Links

• Nathaniel Johnston, Table of n, a(n) for n = 1..215 (complete up to 3999)

Crossrefs

Cf. A142958.

Programs

Maple

for n from 1 to 3999 do if(length(convert(n, roman)) = 4)then printf("%d, ", n): fi: od: # Nathaniel Johnston, May 18 2011

Mathematica

Select[Range[300],StringLength[RomanNumeral[#]]==4&] (* Harvey P. Dale, Aug 20 2021 *)

Extensions

Extended by Nathaniel Johnston, May 18 2011