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A220090 Braille natural numbers (including zero), using "0" as digit concatenation mark. 1
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)
OFFSET
1,1
COMMENTS
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
REFERENCES
L. Braille, Method of writing words, music and plain songs by means of dots, for use by the blind and arranged for them, 1829.
LINKS
PharmaBraille, Pharmabraille
FORMULA
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].
EXAMPLE
a(0)=245, a(8636)=12501240140124, etc.
CROSSREFS
Sequence in context: A306981 A164656 A291587 * A013684 A233821 A216233
KEYWORD
base,easy,nonn
AUTHOR
Marco Ripà, Dec 04 2012
STATUS
approved

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Last modified May 18 12:18 EDT 2024. Contains 372630 sequences. (Running on oeis4.)