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%I #6 Jun 12 2019 13:56:52
%S 60,336,261888,229909120,738152448,25500590080
%N 1/2 times 3-perfect (triply perfect, tri-perfect, triperfect or sous-double) numbers: a(n) = A005820(n)/2.
%C If any odd perfect numbers exist, they should occur in this sequence, unless it is already complete, as some people believe. Please see comments and links in A005820.
%H <a href="/index/O#opnseqs">Index entries for sequences where any odd perfect numbers must occur</a>
%F a(n) = A005820(n)/2.
%Y Cf. A005820.
%K nonn,more,hard
%O 1,1
%A _Antti Karttunen_, Jun 12 2019
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