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a(n) is the largest integer that can be written as (3 + 1/t_1)^m * (3 + 1/t_2)^(n-m) with integers t_1,t_2 >= 2 and 0 < m < n.
4

%I #10 Aug 04 2022 10:20:27

%S 11,37,121,325,1369,3250,14641,50653,161051,327680

%N a(n) is the largest integer that can be written as (3 + 1/t_1)^m * (3 + 1/t_2)^(n-m) with integers t_1,t_2 >= 2 and 0 < m < n.

%C For comments and a PARI program see A356275.

%Y Cf. A355626, A356275, A356276, A356277, A356279.

%K nonn,more

%O 2,1

%A _Markus Sigg_, Aug 03 2022

%E a(11) from _Jinyuan Wang_, Aug 04 2022