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A220090
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Braille natural numbers (including zero), using "0" as digit concatenation mark.
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1
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245, 1, 12, 14, 145, 15, 124, 1245, 125, 24, 10245, 101, 1012, 1014, 10145, 1015, 10124, 101245, 10125, 1024, 120245, 1201, 12012, 12014, 120145, 12015, 120124, 1201245, 120125, 12024, 140245, 1401, 14012, 14014, 140145, 14015, 140124, 1401245
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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Let "0" be the digit concatenation mark, it can be replaced with a "SPACE" as well.
XO OO OO OX OO OO
Let us define OO-->1; XO-->2; OO-->3; OO-->4; OX-->5 and OO-->6.
OO OO XO OO OO OX
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REFERENCES
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L. Braille, Method of writing words, music and plain songs by means of dots, for use by the blind and arranged for them, 1829.
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LINKS
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FORMULA
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Let a(0)=245, a(1)=1, a(2)=12, a(3)=14, a(4)=145, a(5)=15, a(6)=124, a(7)=1245, a(8)=125, a(9)=24, then a(n'_n''_..._n''''') = a(n'0n''0...0n'''''), where any [n]''...' is an element of [0,1,2,3,4,5,6,7,8,9].
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EXAMPLE
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a(0)=245, a(8636)=12501240140124, etc.
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CROSSREFS
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KEYWORD
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base,easy,nonn
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AUTHOR
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STATUS
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approved
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