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

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

%S 1,9,9859,99859,771891,987917,8879859,75879891,75891891,89191859,

%T 98575859,881575859,985889891,999575859,999787917,7181581859,

%U 8881991891,8885875859,8888171859,8897857917,71775871859,88758771891,88881717917,99597789891,99857857917,99997857917,99999575859,718175178891,871711871891,888571871891

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

%C Generated with DrScheme.

%H Jonathan Wellons, <a href="/A137063/b137063.txt">Table of n, a(n) for n = 1..62</a>

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

%e 87175179719859^2 = 7599511959189715877718979881.

%K base,nonn

%O 1,2

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