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%I #10 Jan 12 2020 14:43:45
%S 4,5,11,16,23,29,30,32,47,59,62,64,65,84,95,101,119,125,126,128,131,
%T 154,164,170,185,191,203,204,239,251,254,256,257
%N Numbers n for which there exists a perfect n X n parity pattern with 8-fold symmetry.
%C See A118141 for definitions and references.
%C If an odd number m appears then so does 2m+1.
%Y Cf. A118141.
%K nonn,more
%O 1,1
%A _Don Knuth_, May 11 2006