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6, 9, 33, 66, 99, 333, 666, 999, 3333, 6666, 9999, 33333, 66666, 99999, 333333, 666666, 999999, 3333333, 6666666, 9999999, 33333333, 66666666, 99999999, 333333333, 444444444, 555555555, 666666666, 777777777, 888888888, 999999999
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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FORMULA
| Pattern exhibited by early terms does not continue without interruption. First disruption occurs at a(25)=444444444. Terms with k-digits exhibit the earlier pattern where (10^k-1)/9 is squarefree and k=9 is the first occurrence where (10^k-1)/9 is not squarefree. Others occur at k=18, 22, 27, 36, 42, 44, 45. - Ray Chandler (rayjchandler(AT)sbcglobal.net), Aug 04 2003
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CROSSREFS
| Cf. A084004, A084005, A084006.
Sequence in context: A192425 A147415 A105866 * A046634 A166624 A025628
Adjacent sequences: A084004 A084005 A084006 * A084008 A084009 A084010
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KEYWORD
| base,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.comandmenakan_s(AT)yahoo.com), May 23 2003
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EXTENSIONS
| More terms from Ray Chandler (rayjchandler(AT)sbcglobal.net), May 31 2003
More terms from Ray Chandler (rayjchandler(AT)sbcglobal.net), Aug 04 2003
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