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%I #11 Mar 03 2021 12:05:37
%S 0,7,70,77,700,707,770,777,7000,7007,7070,7077,7700,7707,7770,7777,
%T 70000,70007,70070,70077,70700,70707,70770,70777,77000,77007,77070,
%U 77077,77700,77707,77770,77777,700000,700007,700070,700077,700700,700707,700770,700777
%N Numbers whose set of base 10 digits is {0,7}.
%H Reinhard Zumkeller, <a href="/A204094/b204094.txt">Table of n, a(n) for n = 0..10000</a>
%F a(n) = 7 * A007088(n).
%t FromDigits/@Tuples[{0,7},6] (* _Harvey P. Dale_, Mar 03 2021 *)
%o (Haskell)
%o a204094 n = a204094_list !! n
%o a204094_list = map (* 7) a007088_list
%Y Cf. A078246, A169965, A169966, A169967, A169964, A204093, A204095, A097256.
%K nonn,base
%O 0,2
%A _Reinhard Zumkeller_, Jan 10 2012
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