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Numbers k such that k and k^2 use only the digits 2, 4, 5, 6 and 8.
1

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

%S 2,5,8,22,25,65,68,242,258,262,665,668,828,2585,2868,6665,6668,8284,

%T 24262,25465,25622,25668,26242,65465,65485,66665,66668,242662,254222,

%U 254665,654665,666665,666668,668465,684585,828665,2426662,2546485,2554522,2565668,2566485,2624585,6546485,6546665,6654665,6666665,6666668,6668465,6842868

%N Numbers k such that k and k^2 use only the digits 2, 4, 5, 6 and 8.

%C Generated with DrScheme.

%H Jonathan Wellons, <a href="/A137095/b137095.txt">Table of n, a(n) for n = 1..419</a>

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

%e 828648468686484^2 = 686658284656454854284284282256.

%K base,nonn

%O 1,1

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