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%I #12 Jun 05 2020 04:34:25
%S 1,2,12,15,18,22,26,28,30,40,41,48,50,52,58,80,82,88,98,103,106,130,
%T 135,136,138,139,140,142,150,152,159,164,165,166
%N Orders m for which the only perfect digital invariants of order m are 0 and 1.
%C a(1), a(2), ... are the indices m for which A255668(m)=2, also A003321(m)=0, also A046761(m)=1.
%C The values seem to appear in clusters.
%e a(3)=12 because there's no solution to x=(x_{12}...x_1x_0)_{10} = x_{12}^{12}+...+x_1^{12}+x_0^{12} except x=0 and x=1.
%Y Cf. A003321, A046761, A255668.
%K nonn,base,more
%O 1,2
%A _Don Knuth_, Sep 10 2015
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