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a(n) is the first term in a chain of at least n consecutive numbers each with exactly 8 distinct prime factors.
4

%I #2 Mar 30 2012 17:35:01

%S 9699690,65893166030,10042712381260

%N a(n) is the first term in a chain of at least n consecutive numbers each with exactly 8 distinct prime factors.

%C For exactly 9 distinct prime factors, a(1) = 223092870 and a(2) = 5702759516090.

%Y Cf. A087977, A087978, A138206, A138207.

%K bref,nonn

%O 1,1

%A _Donovan Johnson_, Jan 15 2009