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%I #11 Jul 17 2017 10:36:10
%S 510510,965009045,30989984674,1673602584618
%N a(n) is the first term in a chain of at least n consecutive numbers each with exactly 7 distinct prime factors.
%C a(5) > 10^13.
%H Roger B. Eggleton and James A. MacDougall, <a href="http://www.jstor.org/stable/27643119">Consecutive integers with equally many principal divisors</a>, Math. Mag. 81 (2008), 235-248. [_T. D. Noe_, Oct 13 2008]
%Y Cf. A087977, A087978, A138206, A154573.
%K nonn,more
%O 1,1
%A _Donovan Johnson_, Mar 06 2008
%E a(4) from _Donovan Johnson_, Jan 15 2009
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