A204094 - OEIS

%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