A242182 Numbers with four C's in Roman numerals.

390, 391, 392, 393, 394, 395, 396, 397, 398, 399, 890, 891, 892, 893, 894, 895, 896, 897, 898, 899, 1390, 1391, 1392, 1393, 1394, 1395, 1396, 1397, 1398, 1399, 1890, 1891, 1892, 1893, 1894, 1895, 1896, 1897, 1898, 1899

Offset

1,1

Comments

These will always have CCCXC in them.

Links

Table of n, a(n) for n=1..40.

Index entries for linear recurrences with constant coefficients, signature (1,0,0,0,0,0,0,0,0,1,-1).

Example

390 = CCCXC; 890 = DCCCXC

Mathematica

Select[Range[2000], StringCount[RomanNumeral[#], "C"]==4&] (* or *) LinearRecurrence[{1, 0, 0, 0, 0, 0, 0, 0, 0, 1, -1}, {390, 391, 392, 393, 394, 395, 396, 397, 398, 399, 890}, 40] (* Harvey P. Dale, Jul 30 2015 *)

Prog

(PARI) lista() = {for (i=0, 9, for (j=0, 9, print1((390+j)+500*i, ", "); ); ); } \\ Michel Marcus, May 14 2014

Crossrefs

Sequence in context: A299719 A300340 A228580 * A136153 A069477 A325993

Adjacent sequences: A242179 A242180 A242181 * A242183 A242184 A242185

Keyword

nonn,easy,less,base

Author

J. Lowell, May 06 2014

Status

approved