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A103618
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Number of steps required for n to reach a digit count invariant or cycle loop under the 'Look and Say' function A045918.
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0
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10, 12, 11, 12, 8, 10, 10, 10, 10, 10, 9, 11, 10, 11, 7, 9, 9, 9, 9, 9, 6, 10, 0, 9, 6, 6, 6, 6, 6, 6, 8, 11, 9, 10, 6, 8, 8, 8, 8, 8, 9, 7, 6, 6, 7, 8, 9, 9, 9, 9, 10, 9, 6, 8, 8, 7, 9, 10, 10, 10, 12, 9, 6, 8, 9, 9, 7, 10, 12, 12, 13, 9, 6, 8, 9, 10, 10, 7, 12, 13, 14, 9, 6, 8, 9, 10, 12, 12, 7, 13
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| Madras Math., Descriptive Numbers: Table of results
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EXAMPLE
| a(10)=9 because we have the 9-step chain 10 -> 1011 -> 1031 -> 102113 -> 103112113 -> 10411223 -> 1031221314 -> 1041222314 -> 1031321324 -> 1031223314, the latter being autobiographical, hence invariant. Also, a(40)=9 since we have the digit count iteration 40 -> 1014 -> 102114 -> 10311214 -> 1041121314 -> 1051121324 -> 104122131415 -> 105122132415 -> 104132131425 -> 104122232415 <-> 103142132415, ending in a 2-cycle loop.
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CROSSREFS
| Cf. A005151, A047841, A104785, A104786, A104787.
Sequence in context: A064841 A064795 A078285 * A187285 A098732 A109394
Adjacent sequences: A103615 A103616 A103617 * A103619 A103620 A103621
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KEYWORD
| nonn,base
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AUTHOR
| Lekraj Beedassy (blekraj(AT)yahoo.com), Mar 25 2005
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EXTENSIONS
| Corrected and extended by Sean A. Irvine (sairvin(AT)xtra.co.nz), Feb 08 2010
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