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%I #20 Nov 17 2024 07:29:10
%S 11,31,49,62,73,82,83,85,92,119,125,139,145,151,157,167,173,179,199,
%T 221,223,238,245,247,250,251,255,257,262,263,265,278,284,295,328,332,
%U 359,389,406,413,433,445,461,467,471,487,491,494,509,515,523,530,533,539,551,556,557,590
%N Numbers that cannot be generated from the box stacking described below.
%C Boxes on the bottom row are labeled 1.
%C Boxes not on the bottom row must be supported directly below, and are labeled as the sum of the 2 or 3 boxes they are directly above, including diagonally.
%C Powers of 2 and powers of 3 are not in this list.
%e The first 9 numbers can be generated like this:
%e 1 2 3 4 5 6 7 8 9
%e 11 111 22 23 33 232 233 333
%e 11 111 1111 111 1111 11111
%Y Cf. A000079, A000244.
%K nonn
%O 1,1
%A _Erich Friedman_, Oct 29 2024
%E a(38)-a(54) from _Alois P. Heinz_, Oct 30 2024