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A072499
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Product of divisors of n which are <= n^(1/2).
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3
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1, 1, 1, 2, 1, 2, 1, 2, 3, 2, 1, 6, 1, 2, 3, 8, 1, 6, 1, 8, 3, 2, 1, 24, 5, 2, 3, 8, 1, 30, 1, 8, 3, 2, 5, 144, 1, 2, 3, 40, 1, 36, 1, 8, 15, 2, 1, 144, 7, 10, 3, 8, 1, 36, 5, 56, 3, 2, 1, 720, 1, 2, 21, 64, 5, 36, 1, 8, 3, 70, 1, 1152, 1, 2, 15, 8, 7, 36, 1, 320, 27, 2, 1, 1008, 5, 2, 3, 64, 1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,4
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COMMENTS
| a(1) = 1 and a(24) = 24. For each pair of primes p,q such that p < q < p^2, if n = p^3*q, then a(n) = n. There are others as well; e.g. a(40)=40. - Don Reble, Aug 02, 2002.
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EXAMPLE
| a(20) = 8. The divisors of 20 are 1,2,4,5,10 and 20. a(20) = 1*2 *4= 8.
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CROSSREFS
| Cf. A072500, A072501.
Sequence in context: A034880 A070966 A072504 * A060272 A174713 A129985
Adjacent sequences: A072496 A072497 A072498 * A072500 A072501 A072502
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 20 2002
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EXTENSIONS
| More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Feb 02 2003
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