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Search: id:A079475
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| A079475 |
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Number described by n using the "Look and Say" rule. |
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+0
3
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| 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 11, 22, 33, 44, 55, 66, 77, 88, 99, 0, 111, 222, 333, 444, 555, 666, 777, 888, 999, 0, 1111, 2222, 3333, 4444, 5555, 6666, 7777, 8888, 9999, 0
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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n is read one digit at a time, leftover single digits describe themselves, and trailing zeros are ignored.
In many, but not all cases, a(n) acts as an inverse to the "Look and Say" sequence A005150. For example, 4113 -> 142113 under the "Look and Say", and 142113 -> 4113 under a(n).
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EXAMPLE
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142113 can be read as one "4", two "1"s, one "3", and so describes 4113. Hence a(142113) = 4113. 123 can be read as one "2", "3", and so describes 23. (The leftover digit 3 describes itself.) Hence a(123) = 23. Note that a(1213) = 23 also. 40 can be read as four "0"s, so a(40) = 0. (Trailing zeros are ignored.) 4. a(5) = 5. A single digit describes itself.
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CROSSREFS
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Cf. A005150.
Sequence in context: A087471 A128212 A007954 this_sequence A081286 A080867 A095187
Adjacent sequences: A079472 A079473 A079474 this_sequence A079476 A079477 A079478
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KEYWORD
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base,nonn,nice
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AUTHOR
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Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Jan 15 2003
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