A137107 - OEIS

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

%S 2,7,22,27,28,88,222,278,288,472,478,882,972,2788,2878,4722,4778,4788,

%T 8788,8882,28772,28788,49272,49277,49472,49722,49777,49778,49788,

%U 49827,88277,88472,88878,99722,278788,278978,279272,287972,299788,477278,478277,492222,492878,497788,499472,499478,887288,887972,888228,942222,942278,999472

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

%C Generated with DrScheme.

%H Jonathan Wellons, <a href="/A137107/b137107.txt">Table of n, a(n) for n = 1..633</a>

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

%e 492792849479827^2 = 242844792498447429944479949929.

%K base,nonn

%O 1,1

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