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Search: id:A087306
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| A087306 |
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a(n) is the start of the first arithmetic progression with common difference n of n numbers with the same prime signature. |
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+0
3
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OFFSET
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1,2
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COMMENT
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First column of A087307; main diagonal of A114656.
a(7) > 29*10^9; a(8) = 11978.
a(n) > 10^10 for n from 9 to 11. a(12) = 120998. [From Donovan Johnson (donovan.johnson(AT)yahoo.com), Oct 24 2009]
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EXAMPLE
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a(4) = 111 as 111, 115, 119 and 123 all are of the prime signature p*q.
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CROSSREFS
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Cf. A087307, A114656.
Sequence in context: A039934 A156990 A075514 this_sequence A139964 A048797 A163320
Adjacent sequences: A087303 A087304 A087305 this_sequence A087307 A087308 A087309
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KEYWORD
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nonn,hard
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 02 2003
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EXTENSIONS
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Edited and extended by David Wasserman (dwasserm(AT) earthlink.net), Jan 08 2006
a(7) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Oct 24 2009
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