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%I #9 Apr 12 2024 09:51:26
%S 0,2,20,26,200,260,474,2000,2600,2602,4740,4762,20000,20602,26000,
%T 26020,26602,47400,47620,77474,77602,200000,206020,260000,260200,
%U 266020,474000,476200,476474,476662,774740,776020,2000000,2006002,2060200,2060762,2600000,2602000,2647026,2660200,4474674,4740000,4762000,4764740,4766620,7747400
%N Numbers k such that k and k^2 use only the digits 0, 2, 4, 6 and 7.
%C Generated with DrScheme.
%H Jonathan Wellons, <a href="/A136903/b136903.txt">Table of n, a(n) for n = 1..661</a>
%H J. Wellons, <a href="https://web.archive.org/web/20090206165028/http://jonathanwellons.com/shared-digits/">Tables of Shared Digits</a> [archived]
%e 776020464064074^2 = 602207760646220766424777477476.
%t Module[{d={0,2,4,6,7}},Select[FromDigits/@Tuples[d,7],SubsetQ[d,IntegerDigits[ #^2]]&]] (* _Harvey P. Dale_, Nov 27 2022 *)
%K base,nonn,changed
%O 1,2
%A Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008
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