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Numbers whose base-9 representation has the same nonzero number of 2's and 5's.
0

%I #13 Jun 30 2021 01:54:01

%S 23,47,104,128,167,176,194,203,207,208,210,211,213,214,215,221,230,

%T 239,266,290,347,371,407,416,423,424,426,427,429,430,431,434,443,461,

%U 470,479,509,533,590,614,671,695,752,776,833,857,896,905,923,932,936

%N Numbers whose base-9 representation has the same nonzero number of 2's and 5's.

%t Select[Range[1000],DigitCount[#,9,2]==DigitCount[#,9,5]>0&] (* _Harvey P. Dale_, Dec 16 2019 *)

%Y Cf. A007095.

%K nonn,base,easy

%O 1,1

%A _Olivier GĂ©rard_