A215174 - OEIS

%I #26 Feb 06 2016 12:12:44

%S 8,18,130,6890,254930,3352570,683351890,45139676530,2744959126130

%N a(n) is the least term of A214723 having n different prime divisors, or 0 if no such term exists.

%C Conjectures. 1) For every n, a(n)>0; 2) for n>=3, a(n)==0 (mod 10).

%C If 1) is true, then A215113 is unbounded.

%C The corresponding positions m=m(n) such that A214723(m)=a(n) are 1,3,12,132,2074,18625,2138668. m(8) exists and the calculations show that it is >= 24866450, although up to now the exact its value is unknown.

%Y Cf. A214723, A215113.

%K nonn,more

%O 1,1

%A _Vladimir Shevelev_, _Zak Seidov_, _Robert G. Wilson v_, Aug 05 2012

%E a(9) from _Donovan Johnson_, Aug 19 2012