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Search: id:A098595
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| A098595 |
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Roman numerals version of the Look and Say sequence (original at A005150). |
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+0
2
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| 1, 11, 111, 1111, 151, 111511, 111115111, 51151111, 1511115151, 111515115111511, 111115111511115111115111, 51151111151511551151111, 15111155115111511111511115151, 111515111511115111115511515115111511, 1111151115111115151155111511115111511115111115111, 511511111551151115111115111115151151111151511551151111
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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This sequence is suggested at the link given in point 7 at the bottom of the page, but it is given as: I, II, III, IIII, IIV, IIIIV, IVIIV, ... The 5th term seems to use the "number" followed by "frequency" method (one appears 4 times -> "I"//"IV") but the 6th and 7th terms use the usual "frequency"//"number" method.
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LINKS
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T. Sillke, Conway sequence
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FORMULA
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We write the Roman numerals as I, II, III, IV, V and convert the letters into 1's and 5s for the inclusion in the encyclopaedia.
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EXAMPLE
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a(1)=I=1; a(2)="one I"="II"=11; a(3)=111; a(4)=1111; a(5)="four Is"="IVI"=151
and so on.
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CROSSREFS
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Cf. A005150 for original Look and Say sequence and a number of references.
Sequence in context: A110437 A110444 A114397 this_sequence A077488 A039988 A083440
Adjacent sequences: A098592 A098593 A098594 this_sequence A098596 A098597 A098598
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KEYWORD
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base,easy,nonn
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AUTHOR
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Mark Hudson (mrmarkhudson(AT)hotmail.com), Sep 17 2004
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EXTENSIONS
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More terms from David Wasserman (dwasserm(AT)earthlink.net), Feb 25 2008
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