cp's OEIS Frontend

A356083 Matula-Goebel number of the complete ternary tree of n levels.

%I A356083 #8 Jul 28 2022 17:00:32
%S A356083 1,8,6859,328951971956791,
%T A356083 1658040970678649782777422161327743110829397625479
%N A356083 Matula-Goebel number of the complete ternary tree of n levels.
%F A356083 a(n) = prime(a(n-1))^3, for n>=2.
%e A356083 For n=3, the complete ternary tree of 3 levels is
%e A356083          6859
%e A356083       /   |   \     a(3) = prime(8)^3
%e A356083     8     8     8        = 6859
%e A356083    /|\   /|\   /|\
%e A356083   1 1 1 1 1 1 1 1 1
%o A356083 (PARI) a(n) = my(ret=1); for(i=2,n, ret=prime(ret)^3); ret;
%Y A356083 Cf. A007097, A356082 (binary), A356084 (quaternary).
%K A356083 nonn,more
%O A356083 1,2
%A A356083 _Kevin Ryde_, Jul 27 2022
%E A356083 a(5) from _Jinyuan Wang_, Jul 27 2022