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Numbers whose base-7 representation has the same number of 1's and 5's.
1

%I #12 Jun 20 2021 15:04:10

%S 0,2,3,4,6,12,14,16,17,18,20,21,23,24,25,27,28,30,31,32,34,36,42,44,

%T 45,46,48,54,68,75,82,84,86,87,88,90,96,98,100,101,102,104,110,112,

%U 114,115,116,118,119,121,122,123,125,126,128,129,130,132,134,140,142

%N Numbers whose base-7 representation has the same number of 1's and 5's.

%H Daniel Starodubtsev, <a href="/A039038/b039038.txt">Table of n, a(n) for n = 1..10000</a>

%Y Cf. A007093.

%K nonn,base,easy

%O 1,2

%A _Olivier GĂ©rard_