A242181 Numbers with four X's in Roman numerals.

39, 89, 139, 189, 239, 289, 339, 389, 439, 489, 539, 589, 639, 689, 739, 789, 839, 889, 939, 989, 1039, 1089, 1139, 1189, 1239, 1289, 1339, 1389, 1439, 1489, 1539, 1589, 1639, 1689, 1739, 1789, 1839, 1889, 1939, 1989, 2039, 2089, 2139, 2189, 2239, 2289, 2339

Offset: 1

Author

J. Lowell, May 06 2014

Keywords

• nonn
• base
• easy

Comments

All these end in XXXIX.

Examples

			39 = XXXIX; 89 = LXXXIX.
		

Links

• Eric Weisstein's World of Mathematics, Roman Numerals
• Wikipedia, Roman numerals
• Index entries for linear recurrences with constant coefficients, signature (2,-1).

Crossrefs

Cf. A006968.

Programs

Maple

A242181:=n->50*n-11; seq(A242181(n), n=1..50); # Wesley Ivan Hurt, May 07 2014
[seq(convert(50*n-11, roman), n=1..50)]; # for the Roman version - Wolfdieter Lang, May 09 2014

Mathematica

Table[50 n - 11, {n, 50}] (* Wesley Ivan Hurt, May 07 2014 *)

PARI

a(n)=50*n-11 \\ Charles R Greathouse IV, May 06 2014

Formula

a(n) = 50n - 11. - Charles R Greathouse IV, May 06 2014

Extensions

More terms from Wesley Ivan Hurt, May 07 2014