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Search: id:A117214
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| 1, 1, 2, 6, 1, 30, 3, 210, 2310, 15, 2, 30030, 510510, 10, 105, 9699690, 1155, 223092870, 1, 6469693230, 70, 15015, 6, 200560490130, 255255, 770, 7420738134810, 5, 304250263527210, 4849845, 13082761331670030, 10010
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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Product of all primes up to greatest prime factor of n-th square-free number that do not divide the n-th square-free number. - Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Oct 09 2006
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EXAMPLE
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10 is the 7th squarefree integer. And 2*3*5 = 30 is the smallest primorial number divisible by 10 = 2*5. So a(7) = 30/10 = 3.
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CROSSREFS
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Cf. A117213.
Cf. A006530, A005117, A073482.
Sequence in context: A008855 A132181 A027642 this_sequence A134301 A004544 A010590
Adjacent sequences: A117211 A117212 A117213 this_sequence A117215 A117216 A117217
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KEYWORD
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more,nonn
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), Mar 03 2006
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EXTENSIONS
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More terms from Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Oct 09 2006
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