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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 Table of n, a(n) for n=1..38. 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 Adjacent sequences: A220087 A220088 A220089 * A220091 A220092 A220093 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.)