| 1, 2, 3, 3, 5, 6, 7, 7, 7, 10, 11, 11, 13, 14, 15, 15, 17, 17, 19, 19, 21, 22, 23, 23, 23, 26, 26, 26, 29, 30, 31, 31, 33, 34, 35, 35, 37, 38, 39, 39, 41, 42, 43, 43, 43, 46, 47, 47, 47, 47, 51, 51, 53, 53, 55, 55, 57, 58, 59, 59, 61, 62, 62, 62, 65, 66, 67, 67, 69, 70, 71, 71
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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a(n) = Max( core(k) : k=1,2,3,...,n ) where core(x) is the square-free part of x (the smallest integer such that x*core(x) is a square).
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LINKS
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R. Zumkeller, Table of n, a(n) for n = 0..10000
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CROSSREFS
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Cf. A005117, A007947, A067535, A076260.
Cf. A081217, A081218, A081210.
Sequence in context: A081211 A081213 A081210 this_sequence A036410 A008670 A039852
Adjacent sequences: A070318 A070319 A070320 this_sequence A070322 A070323 A070324
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KEYWORD
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easy,nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), May 11 2002
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EXTENSIONS
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New description from Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 03, 2002
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