A220090 Braille natural numbers (including zero), using "0" as digit concatenation mark.

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

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