%I #6 Nov 16 2017 16:28:18

%S 2,3,5,30,180,300,450,1080,1800,2700,3000,4500,6480,6750,10800,16200,

%T 18000,27000,30000,38880,40500,45000,64800,67500,97200,101250,108000,

%U 162000,180000,233280,243000,270000,300000,388800,405000,450000,583200

%N For n>3: a(n) is a multiple of three distinct earlier terms.

%H R. G. Wilson, V, <a href="/A007335/a007335.pdf">Note, n.d.</a>

%F a(n) is of the form 2^b*3^c*5^d where either b+c+d=1, or where each of b, c and d are positive and the largest of the three is an odd number less than the sum of the other two. For n>3: a(n) is 30 times a power of 6 times a power of 10 times a power of 15.

%e a(15) = 10800 = 2*30*180 = a(1)*a(4)*a(5).

%Y Cf. A000423.

%K nonn

%O 1,1

%A _Henry Bottomley_, Mar 28 2001