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Search: id:A121993
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| A121993 |
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Numbers n that yield a smaller number a(n) under the "Look and Say" function A045918. |
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+0
1
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| 33, 44, 55, 66, 77, 88, 99, 111, 222, 333, 444, 555, 666, 777, 888, 999, 1111, 1222, 1333, 1444, 1555, 1666, 1777, 1888, 1999, 2000, 2111, 2222, 2233, 2244, 2255, 2266, 2277, 2288, 2299, 2333, 2444, 2555, 2666, 2777, 2888, 2999, 3000, 3111, 3222, 3300
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Eric Weisstein's World of Mathematics, Look and Say Sequence.
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EXAMPLE
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E.g. a(26)=2000 because under the Look and Say operator, 2000 is described as one two three zeros or: 1230, which is smaller than 2000.
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CROSSREFS
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Cf. A045918, A005150, A005341, A023989, A079475.
Sequence in context: A045241 A046041 A140151 this_sequence A050875 A060876 A070121
Adjacent sequences: A121990 A121991 A121992 this_sequence A121994 A121995 A121996
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KEYWORD
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easy,nonn,base
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AUTHOR
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Sergio Pimentel (ferdiego(AT)cox.net), Sep 11 2006
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