A002964 Smallest number requiring n chisel strokes for its representation in Roman numerals.

1, 2, 3, 7, 8, 17, 18, 27, 28, 37, 38, 87, 88, 187, 188, 287, 288, 387, 388, 788, 887, 888, 1388, 1788, 1887, 1888, 2388, 2788, 2887, 2888, 3388, 3788, 3887, 3888

Offset

1,2

Comments

A002963(a(n)) = n. - Reinhard Zumkeller, Apr 14 2013

Links

Harvey P. Dale, Table of n, a(n) for n = 1..10000

Eric Weisstein's World of Mathematics, Roman Numerals

Wikipedia, Roman numerals

Mathematica

DeleteDuplicates[Table[{n, Total[Characters[RomanNumeral[n]]/.{"L"->2, "X"->2, "V"->2, "I"->1, "M"->4, "C"->2, "D"->3}]}, {n, 4000}], GreaterEqual[#1[[2]], #2[[2]]]&][[;; , 1]] (* Harvey P. Dale, Jan 19 2025 *)

Prog

(Haskell)
a002964 = (+ 1) . fromJust . (`elemIndex` (map a002963 [1..3888]))
-- Reinhard Zumkeller, Apr 14 2013

Crossrefs

Cf. A002963.

Sequence in context: A062269 A244508 A060121 * A166966 A247843 A181658

Adjacent sequences: A002961 A002962 A002963 * A002965 A002966 A002967

Keyword

base,nonn,nice

Author

N. J. A. Sloane

Extensions

More terms from Erich Friedman

For n>13: data corrected and completed up to A002963(3888)=34 by Reinhard Zumkeller, Apr 14 2013

Status

approved