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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A284924 a(n) is the least n-digit multiple of 5^n using the decimal digits {5, 6, 7, 8, 9} exclusively.

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%I A284924 #9 Apr 07 2017 10:14:53
%S A284924 5,75,875,6875,96875,796875,6796875,66796875,966796875,5966796875,
%T A284924 65966796875,865966796875,8865966796875,68865966796875,
%U A284924 868865966796875,8868865966796875,78868865966796875,578868865966796875,7578868865966796875,87578868865966796875
%N A284924 a(n) is the least n-digit multiple of 5^n using the decimal digits {5, 6, 7, 8, 9} exclusively.
%H A284924 Alois P. Heinz, <a href="/A284924/b284924.txt">Table of n, a(n) for n = 1..1000</a>
%e A284924 a(2) = 75 because 75 is divisible by 5^2 (25*3=75) and uses only digits in the 5-9 interval.
%Y A284924 Cf. A140288, A035014, A053312.
%K A284924 nonn,base
%O A284924 1,1
%A A284924 _J. Lowell_, Apr 05 2017
%E A284924 More terms from _Alois P. Heinz_, Apr 06 2017