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 A084007 a(n) = A084006(n)^(1/2). 4
 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; text; internal format)
 OFFSET 0,1 LINKS Table of n, a(n) for n=0..29. 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, Aug 04 2003 CROSSREFS Cf. A084004, A084005, A084006. Sequence in context: A217048 A105866 A267690 * A046634 A166624 A025628 Adjacent sequences: A084004 A084005 A084006 * A084008 A084009 A084010 KEYWORD base,nonn AUTHOR Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 23 2003 EXTENSIONS More terms from Ray Chandler, May 31 2003 More terms from Ray Chandler, Aug 04 2003 STATUS approved

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Last modified October 4 19:37 EDT 2023. Contains 365888 sequences. (Running on oeis4.)