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%I #10 Aug 18 2015 00:06:04
%S 1,2,6,30,30,210,210,2310,30030,30030,30030,510510,9699690,9699690,
%T 9699690,223092870,223092870,6469693230,6469693230,200560490130,
%U 200560490130,200560490130,200560490130,7420738134810,7420738134810
%N a(n) = product of the primes which are <= the n-th squarefree positive integer. a(n) also is the LCM of the first n squarefree positive integers.
%p A005117 := proc(n) option remember; local a; if n =1 then 1; else a := A005117(n-1)+1 ; while not numtheory[issqrfree](a) do a := a+1 ; od: RETURN(a) ; fi ; end: A128040 := proc(n) lcm( seq(A005117(i),i=1..n) ) ; end: seq(A128040(n),n=1..30) ; # _R. J. Mathar_, Nov 01 2007
%Y Cf. A034386, A005117.
%K nonn
%O 1,2
%A _Leroy Quet_, May 07 2007
%E More terms from _R. J. Mathar_, Nov 01 2007