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 A242181 Numbers with four X's in Roman numerals. 1
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS All these end in XXXIX. LINKS Eric Weisstein's World of Mathematics, Roman Numerals Wikipedia, Roman numerals Index entries for linear recurrences with constant coefficients, signature (2,-1). FORMULA a(n) = 50n - 11. - Charles R Greathouse IV, May 06 2014 EXAMPLE 39 = XXXIX; 89 = LXXXIX. 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 *) PROG (PARI) a(n)=50*n-11 \\ Charles R Greathouse IV, May 06 2014 CROSSREFS Cf. A006968. Sequence in context: A020264 A044177 A044558 * A020168 A063318 A039422 Adjacent sequences:  A242178 A242179 A242180 * A242182 A242183 A242184 KEYWORD nonn,base,easy AUTHOR J. Lowell, May 06 2014 EXTENSIONS More terms from Wesley Ivan Hurt, May 07 2014 STATUS approved

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Last modified September 25 21:07 EDT 2020. Contains 337344 sequences. (Running on oeis4.)