Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #55 Dec 10 2023 18:07:45
%S 1,9,135,2835,70875,1913625,63149625,2210236875,86199238125,
%T 3878965715625,190069320065625,9693535323346875,533144442784078125,
%U 30389233238692453125,1914521694037624546875,124443910112445595546875,8586629797758746092734375
%N Product of first n odd nonprimes, a(n) = Product_{k=1..n} A071904(k).
%t With[{nn = 70}, FoldList[Times, Complement[Range[1, nn, 2], Prime@ Range[2, PrimePi@ nn]]]] (* _Michael De Vlieger_, Apr 21 2019 *)
%o (PARI) lista(nn) = {my(p=1); print1(p, ", "); forcomposite (n=1, nn, if (n%2, p *= n; print1(p, ", ")); ); } \\ _Michel Marcus_, Mar 13 2019
%Y Cf. A071904, A036691, A002866, A001147.
%K nonn
%O 0,2
%A _Zhandos Mambetaliyev_, Mar 13 2019