A136997 - OEIS

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

%S 1,2,11,12,21,22,28,88,122,221,278,418,421,471,472,478,1478,1488,2778,

%T 2878,4141,4271,4721,8472,8878,11141,14771,21171,21778,27771,27878,

%U 84722,88418,88471,112778,112878,118818,211488,272841,277818,287771,414418,422222,477778,878221,884428,1128222,1214171,1477221,1477421,2174278,2178818,2184441

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

%C Generated with DrScheme.

%H Jonathan Wellons, <a href="/A136997/b136997.txt">Table of n, a(n) for n = 1..454</a>

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

%e 847184817428412^2 = 717722114881211772824744841744.

%K base,nonn

%O 1,2

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