A136956 Numbers k such that k and k^2 use only the digits 0, 4, 6, 8 and 9.

0, 8, 64, 80, 98, 640, 664, 800, 898, 980, 998, 6400, 6640, 6664, 8000, 8980, 8998, 9800, 9980, 9998, 64000, 66400, 66640, 66664, 80000, 89800, 89980, 89998, 98000, 98998, 99800, 99980, 99998, 640000, 664000, 664064, 666400, 666640, 666664, 684908, 800000, 806008, 896886, 898000, 899800, 899980, 899998, 980000, 989980, 989998, 990408, 998000

Offset: 1

Author

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

Keywords

• base
• nonn

Comments

Generated with DrScheme.

Examples

			984686089068008^2 = 969606694004048984086049088064.
		

Links

• Jonathan Wellons, Table of n, a(n) for n = 1..1208
• J. Wellons, Tables of Shared Digits [archived]

Crossrefs

Essentially the same as A107626. - R. J. Mathar, Feb 28 2009

Programs

Mathematica

With[{c={0,4,6,8,9}},Select[FromDigits/@Tuples[c,6],SubsetQ[ c, IntegerDigits[ #^2]]&]] (* Harvey P. Dale, Feb 04 2015 *)