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%I #9 Nov 20 2021 11:36:07
%S 11,20,29,33,38,47,56,60,65,74,83,87,92,99,110,114,119,128,137,141,
%T 146,155,164,168,173,180,191,195,200,209,218,222,227,236,245,249,254,
%U 261,272,276,281,290,297,326,330,335,342,353,357,362,371,380,384,389,398
%N Numbers k such that string 0,2 occurs in the base-3 representation of k but not of k-1.
%o (Python)
%o from sympy.ntheory import digits
%o def cond(n): return "02" in "".join(map(str, digits(n, 3)))
%o def ok(n): return cond(n) and not cond(n-1)
%o print([k for k in range(400) if ok(k)]) # _Michael S. Branicky_, Nov 20 2021
%Y Cf. A007089, A044435.
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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