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%I #6 Apr 02 2012 13:31:33
%S 3,5,7,9,15,21,25,35,63,75,1575
%N One of 17 possible sets of eleven numbers of the form 3^alpha 5^beta 7^gamma whose sum of reciprocals is 1.
%D Burshtein, Nechemia. All the solutions of the equation Sum_{i=1..11}} 1/x_i = 1 in distinct integers of the form x_i = 3^alpha 5^beta 7^gamma. Discrete Math. 308 (2008), no. 18, 4286--4292. MR2427761 (2009e:11061)
%Y The 17 solutions are given in A211118-A211134. Cf. A201643, A201644, A201646, A201647, A201648, A201649.
%K nonn,fini,full
%O 1,1
%A _N. J. A. Sloane_, Apr 02 2012
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