A136892 Numbers k such that k and k^2 use only the digits 0, 2, 3, 6 and 7.

0, 6, 26, 60, 260, 600, 606, 2600, 6000, 6006, 6060, 26000, 60000, 60006, 60060, 60600, 260000, 270606, 600000, 600006, 600060, 600600, 606000, 2600000, 2603326, 2706060, 6000000, 6000006, 6000060, 6000600, 6000606, 6006000, 6060000, 6060006, 26000000, 26033260, 27060600, 60000000, 60000006, 60000060, 60000600, 60000606, 60006000

Offset: 1

Author

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

Keywords

• base
• nonn

Comments

Generated with DrScheme.

Examples

			600306307363726^2 = 360367662660672272772060603076.
		

Links

• Jonathan Wellons, Table of n, a(n) for n = 1..558
• J. Wellons, Tables of Shared Digits [archived]

Programs

Mathematica

With[{c={0,2,3,6,7}},Select[FromDigits/@Tuples[c,8],SubsetQ[ c, IntegerDigits[ #^2]]&]] (* Harvey P. Dale, Mar 01 2020 *)