A136931 Numbers k such that k and k^2 use only the digits 0, 3, 4, 6 and 8.

0, 6, 8, 60, 80, 600, 800, 6000, 6638, 6808, 6844, 8000, 60000, 60406, 60688, 66380, 66808, 68080, 68440, 80000, 600000, 604060, 606880, 663800, 668080, 680800, 684400, 800000, 6000000, 6003406, 6004006, 6040600, 6068800, 6638000, 6680800, 6808000, 6844000, 8000000, 60000000, 60034060, 60040060, 60406000, 60688000, 66363008, 66380000

Offset: 1

Author

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

Keywords

• base
• nonn

Comments

Generated with DrScheme.

Examples

			683084686436344^2 = 466604688843838404646364086336.
		

Links

• Jonathan Wellons, Table of n, a(n) for n = 1..378
• J. Wellons, Tables of Shared Digits [archived]

Crossrefs

See also A058429-A058430. - M. F. Hasler, Jan 24 2008

Programs

Mathematica

s={0,3,4,6,8}; Select[Range[0,10^6], SubsetQ[s, Sort[DeleteDuplicates[IntegerDigits[#]]]] && SubsetQ[s, Sort[DeleteDuplicates[IntegerDigits[#^2]]]] &] (* Stefano Spezia, Aug 11 2025 *)