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Search: id:A100385
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| A100385 |
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a(n) = the least number x such that for m=x to x+n-1, A006530(m) decreases. |
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4
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| 2, 3, 13, 13, 491, 1851, 12721, 12721, 109453, 586951, 120797465, 624141002, 4044619541, 267793490438
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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A006530(m) is the largest prime factor of m.
a(15) > 3*10^11. [From Donovan Johnson (donovan.johnson(AT)yahoo.com), Oct 24 2009]
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EXAMPLE
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a(5)=491 because the largest prime factors of 491,492,493,494,495 are 491,41,29,19,11.
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CROSSREFS
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Cf. A006530, A070087, A071870, A100384, A100386.
Sequence in context: A129671 A117684 A056445 this_sequence A128460 A101541 A059670
Adjacent sequences: A100382 A100383 A100384 this_sequence A100386 A100387 A100388
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KEYWORD
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nonn,more
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Dec 09 2004
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EXTENSIONS
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Edited by Don Reble (djr(AT)nk.ca), Jun 13 2007
a(14) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Oct 24 2009
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