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Numbers with exactly 3 2's in their ternary expansion.
3

%I #12 Sep 13 2023 07:19:38

%S 26,53,62,71,74,77,78,79,107,134,143,152,155,158,159,160,170,179,182,

%T 185,186,187,197,206,209,212,213,214,218,221,222,223,227,230,231,232,

%U 234,235,237,238,269,296,305,314,317,320,321

%N Numbers with exactly 3 2's in their ternary expansion.

%H Seiichi Manyama, <a href="/A023701/b023701.txt">Table of n, a(n) for n = 1..10000</a>

%t Select[ Range[ 324 ], (Count[ IntegerDigits[ #, 3 ], 2 ]==3)& ]

%K nonn,base,easy

%O 1,1

%A _Olivier GĂ©rard_