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%I #8 Jul 22 2021 23:26:57
%S 3,6,18,48,114,414,546,627,927,1023,1836,3090,4167,7539,7752,7884,
%T 7950,8250,9093,9621,9870,10779,11226,11622,11886,12363,12465,14994,
%U 16152,17391,19656,20169,20499,22383,23937,25359,25623,26532,26847,27045,27492,28731,31641,31707
%N Ulam numbers k such that k/3 is also an Ulam number.
%Y Cf. A002858.
%K nonn
%O 1,1
%A _Enrique Navarrete_, May 21 2017