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Numbers k such that k and k^2 use only the digits 2, 4, 6, 7 and 9.

1

`%I #7 Apr 12 2024 09:51:27
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`%S 2,7,26,27,264,277,474,792,964,4762,6926,22277,26962,27924,49262,
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`%T 49426,49474,49777,69262,264474,269777,474262,476962,494262,494462,
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`%U 494464,497262,497662,499474,692262,692277,962924,972764,2779262,4767277,4769462,4772277,4944464,4946662,4994777,4996926,4996962,4997262,4997764,9729464,9964674
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`%N Numbers k such that k and k^2 use only the digits 2, 4, 6, 7 and 9.
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`%C Generated with DrScheme.
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`%H Jonathan Wellons, <a href="/A137102/b137102.txt">Table of n, a(n) for n = 1..424</a>
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`%H J. Wellons, <a href="https://web.archive.org/web/20090206165028/http://jonathanwellons.com/shared-digits/">Tables of Shared Digits</a> [archived]
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`%e 974667496967262^2 = 949976729644427679967499776644.
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`%K base,nonn
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`%O 1,1
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`%A Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008
`