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a(n) = Product_{k=1..n} P(k), where P(k) is the smallest prime >= 2*k.
3

%I #5 Apr 12 2023 08:12:43

%S 2,10,70,770,8470,110110,1871870,31821790,604614010,13906122230,

%T 319840811290,9275383527410,268986122294890,7800597546551810,

%U 241818523943106110,8947285385894926070,331049559278112264590

%N a(n) = Product_{k=1..n} P(k), where P(k) is the smallest prime >= 2*k.

%Y Cf. A118455, A118456, A118747.

%K easy,nonn

%O 1,1

%A _Jonathan Vos Post_, Apr 29 2006