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Numbers whose base-2 and base-8 expansions have no digits in common.
1

%I #23 Jun 20 2021 15:28:51

%S 2,3,4,5,6,7,18,19,20,21,22,23,26,27,28,29,30,31,34,35,36,37,38,39,42,

%T 43,44,45,46,47,50,51,52,53,54,55,58,59,60,61,62,63,146,147,148,149,

%U 150,151,154,155,156,157,158,159,162,163,164,165,166,167,170,171

%N Numbers whose base-2 and base-8 expansions have no digits in common.

%H Vincenzo Librandi, <a href="/A037342/b037342.txt">Table of n, a(n) for n = 1..1000</a>

%p q:= n-> (f-> is({}=f(8) intersect f(2)))({k-> convert(n, base, k)[]}):

%p select(q, [$1..200])[]; # _Alois P. Heinz_, Jun 20 2021

%t Select[Range[200],Intersection[IntegerDigits[#,2],IntegerDigits[#,8]] =={}&] (* _Harvey P. Dale_, Jun 06 2011 *)

%K nonn,base

%O 1,1

%A _Clark Kimberling_