%I #5 Feb 11 2024 12:43:30
%S 0,1,3,-1,2,15,-1,4,17,-1,14,6,-1,11,182,-1,16,8,-1,21,13,-1,5,145,-1,
%T 18,10,-1,181,23,-1,349,41,-1,7,147,-1,178,20,-1,12,346,-1,183,25,-1,
%U 144,56,-1,188,30,-1,9,149,-1,48,180,-1,22,317,-1,141,348,-1
%N Index where n first appears in A128333, or -1 if n never appears.
%C Positive multiples of 3 never appear in A128333. Does every other number eventually appear there?
%Y Cf. A128333.
%K sign
%O 0,3
%A _Nick Hobson_, Feb 28 2007
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