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Numbers k such that k and k^2 use only the digits 4, 5, 7, 8 and 9.
1

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

%S 7,88,888,7588,9878,75888,885888,989878,7479878,7589457,7745957,

%T 9775457,97748957,744888978,757944588,945985457,7475598878,9948757588,

%U 88757455957,99977995478,747595978788,947878988978,948445875888,994477479878,997494589457,7588797959878,8875584485457,9475747457588,9478895478788,9745484895478

%N Numbers k such that k and k^2 use only the digits 4, 5, 7, 8 and 9.

%C Generated with DrScheme.

%H Jonathan Wellons, <a href="/A137143/b137143.txt">Table of n, a(n) for n = 1..66</a>

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

%e 947574745798978^2 = 897897898875997774859585844484.

%K base,nonn

%O 1,1

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