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A023718 Numbers with a single 3 in their base 4 expansion. 1

%I

%S 3,7,11,12,13,14,19,23,27,28,29,30,35,39,43,44,45,46,48,49,50,52,53,

%T 54,56,57,58,67,71,75,76,77,78,83,87,91,92,93,94,99,103,107,108,109,

%U 110,112,113,114,116,117,118,120,121,122,131,135

%N Numbers with a single 3 in their base 4 expansion.

%t Select[ Range[ 140 ], (Count[ IntegerDigits[ #, 4 ], 3 ]==1)& ]

%K nonn,base,easy

%O 1,1

%A _Olivier GĂ©rard_

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Last modified January 28 10:24 EST 2022. Contains 350655 sequences. (Running on oeis4.)