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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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2
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OFFSET
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1,2
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COMMENTS
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a(7) > 29*10^9; a(8) = 11978.
a(n) > 10^10 for n from 9 to 11. a(12) = 120998. [From Donovan Johnson, Oct 24 2009]
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LINKS
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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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KEYWORD
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nonn,hard
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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