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A087306 a(n) is the start of the first arithmetic progression with common difference n of n numbers with the same prime signature. +0
3
1, 3, 155, 111, 3875983, 1333, 763274553951, 11978 (list; graph; listen)
OFFSET

1,2

COMMENT

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]

EXAMPLE

a(4) = 111 as 111, 115, 119 and 123 all are of the prime signature p*q.

CROSSREFS

Cf. A087307, A114656.

Sequence in context: A039934 A156990 A075514 this_sequence A139964 A048797 A163320

Adjacent sequences: A087303 A087304 A087305 this_sequence A087307 A087308 A087309

KEYWORD

nonn,hard

AUTHOR

Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 02 2003

EXTENSIONS

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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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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