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A023404 If any power of 2 ends with k 4's and 7's, they must be the first k terms of this sequence in reverse order. 3

%I #13 Jan 27 2022 22:45:33

%S 4,4,7,7,4,4,4,4,4,4,7,4,4,4,4,7,7,4,7,7,7,4,7,4,4,7,4,7,4,4,7,7,4,4,

%T 7,4,7,7,4,4,4,4,4,4,7,4,7,4,4,4,4,4,7,4,7,4,4,7,7,4,4,4,7,4,7,7,4,4,

%U 4,7,7,4,7,4,4,7,4,7,7,7,7,7,4,7,7,7,7,7,7,7,4,4,4,4,4,7,4,7,4,7,7,4,7,7,7,4,4,4

%N If any power of 2 ends with k 4's and 7's, they must be the first k terms of this sequence in reverse order.

%H Ray Chandler, <a href="/A023404/b023404.txt">Table of n, a(n) for n = 1..10000</a>

%K nonn,base

%O 1,1

%A _David W. Wilson_

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