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A059958
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Smallest number m such that m*(m+1) has n distinct prime factors.
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2
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1, 2, 5, 14, 65, 209, 714, 7314, 38570, 254540, 728364, 11243154, 58524465, 812646120, 5163068910, 58720148850, 555409903685
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| a(18) <= 5702759516090. - Donovan Johnson, Oct 05 2011
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FORMULA
| a(n)=Min{m|A001221(m*(m+1))=n}
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EXAMPLE
| n=9, a(n)=38570 since n(n+1)=(2.5.7.19.29)(3.13.23.43) a(n)<=A002110(n)-1 because A001221[(q-1)q]>=n+1.
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CROSSREFS
| Cf. A006549, A001221, A002110, A054989, A083002.
Sequence in context: A008286 A049082 A158095 * A102019 A097595 A081483
Adjacent sequences: A059955 A059956 A059957 * A059959 A059960 A059961
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Mar 02 2001
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EXTENSIONS
| More terms from William Rex Marshall (w.r.marshall(AT)actrix.co.nz), Mar 18 2001
Offset corrected and a(15)-a(16) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Jan 31 2009
a(17) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Sep 15 2010
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