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A059992
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Numbers with an increasing number of nonprime divisors.
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3
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1, 4, 8, 12, 24, 36, 48, 60, 72, 120, 180, 240, 360, 720, 840, 1080, 1260, 1440, 1680, 2160, 2520, 4320, 5040, 7560, 10080, 15120, 20160, 25200, 27720, 30240, 45360, 50400, 55440, 75600, 83160, 110880, 151200, 166320, 221760, 277200, 332640
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Positions of records in A033273.
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LINKS
| Ray Chandler, Table of n, a(n) for n=1..146
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EXAMPLE
| a(4)=12 because twelve has 4 nonprime divisors {1, 4, 6 and 12} whereas a(3)=8 has only 3; and twelve is the first number greater than eight which exhibits this property.
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MATHEMATICA
| l = 0; Do[ c = Count[PrimeQ[ Divisors[n] ], False]; If[c > l, l = c; Print[n] ], {n, 1, 10^6} ]
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CROSSREFS
| Cf. A055079, A002182, A033273, A180040.
Sequence in context: A130643 A014617 A157416 * A050570 A102110 A055079
Adjacent sequences: A059989 A059990 A059991 * A059993 A059994 A059995
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KEYWORD
| nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Mar 08 2001
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EXTENSIONS
| Alternate decription and b-file from Ray Chandler (rayjchandler(AT)sbcglobal.net), Aug 07 2010
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