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Search: id:A121111
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| A121111 |
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Trajectory of 277777788888899 under "x -> product of digits of x" map. |
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+0
2
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| 277777788888899, 4996238671872, 438939648, 4478976, 338688, 27648, 2688, 768, 336, 54, 20, 0
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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This is the smallest number of persistence 11 (cf. A003001). It is conjectured that no number has persistence greater than 11.
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LINKS
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N. J. A. Sloane, The persistence of a number, J. Recreational Math., 6 (1973), 97-98.
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FORMULA
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a(n)=A121110(n-1), n>=3. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 07 2008]
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CROSSREFS
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Cf. A003001.
Sequence in context: A003811 A086439 A086440 this_sequence A080125 A082589 A011528
Adjacent sequences: A121108 A121109 A121110 this_sequence A121112 A121113 A121114
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KEYWORD
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nonn,fini,full
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Aug 12 2006
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