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%I #6 May 08 2021 08:39:23
%S 3,12,18,27,39,42,57,60,63,84,87,90,96,120,126,129,132,135,144,174,
%T 180,183,189,192,195,198,204,216,255,261,264,270,273,276,285,288,291,
%U 294,297,306,324,363,381,384,390,393,396,399,405,408,411,414,429,432
%N Positions of words in A342753 having 1st digit 1 and last digit 1.
%C Every positive integer is in exactly one of the sequences A342782, A342783, A342784, and A342785.
%e Positions of the first 2 words in which 1st digit = 1 and last digit = 1 can be read from a list of the first 16 words in A342753: 0, 00, 1, 000, 01, 10, 0000, 001, 100, 010, 00000, 11, 0001, 0100, 1000, 0010.
%t (See A342753.)
%Y Cf. A342753, A342782, A342783, A342784, A342786.
%K nonn,base
%O 1,1
%A _Clark Kimberling_, May 07 2021