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A160754
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Numbers n such that n, 2n, 3n and 4n use the same number of characters when expressed in Roman numerals
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0
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OFFSET
| 1,1
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COMMENTS
| This sequence is complete up to 3999.
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EXAMPLE
| 36= XXXVI, 2*36= 72= LXXII, 3*36=108=CVIII, 4*36=144= CXLIV
153= CLIII, 2*153=306=CCCVI, 3*153=459=CDLIX, 4*153=612= DCXII
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MAPLE
| for n from 1 to 3999 do if(length(convert(n, roman)) = length(convert(2*n, roman)) and length(convert(n, roman)) = length(convert(3*n, roman)) and length(convert(n, roman)) = length(convert(4*n, roman)))then printf("%d, ", n): fi: od: # Nathaniel Johnston, May 18 2011
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CROSSREFS
| Sequence in context: A203753 A039495 A034592 * A117511 A064244 A064500
Adjacent sequences: A160751 A160752 A160753 * A160755 A160756 A160757
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KEYWORD
| nonn,easy
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AUTHOR
| Claudio L Meller (claudiomeller(AT)gmail.com), May 25 2009
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EXTENSIONS
| a(8) from Nathaniel Johnston (nathaniel(AT)nathanieljohnston.com), May 18 2011
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