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a(n) is the least number with exactly n odd divisors that are <= sqrt(n).
1

%I #4 May 13 2020 19:00:09

%S 1,9,30,90,225,315,630,945,1575,2835,4410,3465,8190,6930,14175,10395,

%T 27720,17325,35910,31185,66150,62370,99225,45045,198450,90090,121275,

%U 103950,207900,155925,415800,135135,311850,368550,353430,225225,1158300,706860

%N a(n) is the least number with exactly n odd divisors that are <= sqrt(n).

%C Index of first occurrence of n in A069288.

%Y Cf. A005179, A038547, A038549, A069288.

%K nonn

%O 1,2

%A _Ilya Gutkovskiy_, May 13 2020