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a(n) is the first term in a chain of at least n consecutive numbers each with exactly 6 distinct prime factors.
6

%I #11 Jul 17 2017 10:35:59

%S 30030,11243154,323567034,7933641735,45212320502,626804494291,

%T 7563009743844

%N a(n) is the first term in a chain of at least n consecutive numbers each with exactly 6 distinct prime factors.

%C a(8) > 10^13. [_Donovan Johnson_, Jan 15 2009]

%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, A138207.

%Y Cf. A154573. [_Donovan Johnson_, Jan 15 2009]

%K nonn,more

%O 1,1

%A _Donovan Johnson_, Mar 06 2008

%E a(6)-a(7) from _Donovan Johnson_, Jan 15 2009