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Search: id:A072283
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| A072283 |
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Number of raised dots to represent n in Braille. |
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+0
3
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| 7, 5, 6, 6, 7, 6, 7, 8, 7, 6, 8, 6, 7, 7, 8, 7, 8, 9, 8, 7, 9, 7, 8, 8, 9, 8, 9, 10, 9, 8, 9, 7, 8, 8, 9, 8, 9, 10, 9, 8, 10, 8, 9, 9, 10, 9, 10, 11, 10, 9, 9, 7, 8, 8, 9, 8, 9, 10, 9, 8, 10, 8, 9, 9, 10, 9, 10, 11, 10, 9, 11, 9, 10, 10, 11, 10, 11, 12, 11, 10, 10, 8, 9, 9, 10, 9, 10, 11, 10, 9
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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Each term of this sequence includes 4, the number of raised dots to represent the numeral sign. This is normally necessary since the representations of the numerals "1" through "9" and then "0" are otherwise identical to the representations of the letters "a" through "j", respectively. In some contexts the numeral sign is unnecessary.
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LINKS
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RNIB, This is Braille
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FORMULA
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The decimal digits map to numbers of Braille raised dots as follows: 0 -> 3, 1 -> 1, 2 -> 2, 3 -> 2, 4 -> 3, 5 -> 2, 6 -> 3, 7 -> 4, 8 -> 3 and 9 -> 2.
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EXAMPLE
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a(10) = 8 because "10" is represented by the numeral sign "#" (4 raised dots), the digit one (1 raised dot) and digit zero (3 raised dots) and 4 + 3 + 1 = 8. Here is a depiction of the Braille representation, where "o" denotes a raised dot, "-" denotes unused space and each Braille character occupies a 3 X 2 cell:
-o o- -o
-o -- oo
oo -- --
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CROSSREFS
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Equals A079399(n) + 4.
Sequence in context: A158244 A011474 A154171 this_sequence A113812 A011198 A110943
Adjacent sequences: A072280 A072281 A072282 this_sequence A072284 A072285 A072286
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KEYWORD
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base,nonn
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AUTHOR
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Rick L. Shepherd (rshepherd2(AT)hotmail.com), Jul 10 2002
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