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A104350
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Partial products of largest prime factors of numbers <= n.
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24
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1, 2, 6, 12, 60, 180, 1260, 2520, 7560, 37800, 415800, 1247400, 16216200, 113513400, 567567000, 1135134000, 19297278000, 57891834000, 1099944846000, 5499724230000, 38498069610000, 423478765710000, 9740011611330000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Partial Products of A006530: a(n)=Prod(A006530(k):1<=k<=n);
a(n) = a(n-1)*A006530(n) for n>1, a(1) = 1;
A020639(a(n))=A040000(n-1), A006530(a(n))=A007917(n) for n>1,
A001221(a(n))=A000720(n), A001222(a(n))=A001477(n-1);
A007947(a(n))=A034386(n);
a(n) = A000142(n) / A076928(n). [Corrected by Franklin T. Adams-Watters, Oct 30 2006]
In decimal representation: A104351(n) = number of digits of a(n), A104355(n) = number of trailing zeros of a(n);
A104357(n) = a(n) - 1, A104365(n) = a(n) + 1.
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LINKS
| Eric Weisstein's World of Mathematics, Greatest Prime Factor
R. Zumkeller, Products of largest prime factors of numbers <= n
Charles R Greathouse IV, Table of n, a(n) for n = 1..641
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CROSSREFS
| Cf. A046670, A000142, A002110, A072486.
Sequence in context: A195307 A101657 A104371 * A072489 A072487 A189394
Adjacent sequences: A104347 A104348 A104349 * A104351 A104352 A104353
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KEYWORD
| nonn
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AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 06 2005
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EXTENSIONS
| More terms from David Wasserman (dwasserm(AT)earthlink.net), Apr 24 2008
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