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A086560
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Start of first run of n successive numbers in which i-th number has exactly i distinct prime divisors for i = 1..n.
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3
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OFFSET
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1,1
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REFERENCES
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J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 64, p. 23, Ellipses, Paris 2008.
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LINKS
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Table of n, a(n) for n=1..8.
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EXAMPLE
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a(3) = 64, as 64 has 1, 65 has 2 and 66 has 3 prime divisors: 64 = 2^6, 65 = 5*13 and 66 = 2*3*11
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CROSSREFS
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Cf. A072875.
Sequence in context: A012978 A012949 A076630 * A133004 A175169 A066933
Adjacent sequences: A086557 A086558 A086559 * A086561 A086562 A086563
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KEYWORD
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more,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 30 2003
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EXTENSIONS
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More terms from Don Reble (djr(AT)nk.ca), Sep 13 2003
a(7) from Donovan Johnson, Mar 06 2008
a(8) from Donovan Johnson, Jul 19 2011
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STATUS
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approved
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