

A087306


a(n) is the start of the first arithmetic progression with common difference n of n numbers with the same prime signature.


2




OFFSET

1,2


COMMENTS

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]


LINKS



EXAMPLE

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


CROSSREFS



KEYWORD

nonn,hard


AUTHOR



EXTENSIONS



STATUS

approved



