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Search: id:A116486
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| A116486 |
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Numbers n such that both n and n+1 are logarithmically smooth. |
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+0
3
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| 8, 24, 80, 125, 224, 2400, 3024, 4224, 4374, 6655, 9800, 10647, 123200, 194480, 336140, 601425, 633555, 709631, 5142500, 5909760, 11859210, 1611308699
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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N is logarithmically smooth if its largest prime factor is not more than ceiling(log2(n)).
Is the sequence finite?
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LINKS
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More information
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EXAMPLE
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125 is there because 125=5*5*5, 126=2*3*3*7; no prime factor is greater than ceiling(log2(125))=7.
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CROSSREFS
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Adjacent sequences: A116483 A116484 A116485 this_sequence A116487 A116488 A116489
Sequence in context: A005051 A083583 A078158 this_sequence A141317 A097544 A128688
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KEYWORD
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nonn
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AUTHOR
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Harsh R. Aggarwal (harsh251(AT)yahoo.com), Mar 20 2006
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EXTENSIONS
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Edited by Don Reble (djr(AT)nk.ca), Apr 07 2006
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