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A110401
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a(1) = 999, a(n) is the number obtained by concatenating product of neighboring digits of the previous term.
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999, 8181, 888, 6464, 242424, 88888, 64646464, 24242424242424, 8888888888888, 646464646464646464646464, 2424242424242424242424242424242424242424242424, 888888888888888888888888888888888888888888888
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| If one takes a(1) = any other number in some cases the sequence comes to an end with a single digit term. otherwise the sequence eventually contains increasing strings of 8, 64 and 24 repeatedly. e.g. a(1) =1234 gives 1234,2612,1262,21212,2222,444,1616,666,3636,181818,88888,64646464,24242424242424,8888888888888,...
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CROSSREFS
| Sequence in context: A091365 A043527 A117720 * A164813 A164814 A038459
Adjacent sequences: A110398 A110399 A110400 * A110402 A110403 A110404
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KEYWORD
| base,easy,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 29 2005
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EXTENSIONS
| Corrected and extended by Joshua Zucker (joshua.zucker(AT)stanfordalumni.org), May 10 2006
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