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Numbers k such that k and k^2 use only the digits 0, 4, 5, 7 and 8.
1

%I #7 Apr 12 2024 09:51:27

%S 0,88,878,880,888,7588,8780,8800,8880,74078,75878,75880,87800,88000,

%T 88800,740578,740588,740780,755478,758780,758800,840088,878000,880000,

%U 880088,888000,7405780,7405880,7407800,7554780,7587800,7588000,8400880,8705088,8780000,8800000,8800448,8800880,8880000,74057800,74058800,74078000,74487888

%N Numbers k such that k and k^2 use only the digits 0, 4, 5, 7 and 8.

%C Generated with DrScheme.

%H Jonathan Wellons, <a href="/A136951/b136951.txt">Table of n, a(n) for n = 1..420</a>

%H J. Wellons, <a href="https://web.archive.org/web/20090206165028/http://jonathanwellons.com/shared-digits/">Tables of Shared Digits</a> [archived]

%e 870504454040578^2 = 757778004504484775470470574084.

%K base,nonn

%O 1,2

%A Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008