A136827 Numbers k such that k and k^2 use only the digits 0, 1, 2 and 6.

0, 1, 10, 11, 100, 101, 110, 1000, 1001, 1010, 1011, 1100, 1101, 10000, 10001, 10010, 10011, 10100, 10110, 11000, 11001, 11010, 100000, 100001, 100010, 100011, 100100, 100101, 100110, 101000, 101001, 101100, 110000, 110001, 110010, 110100, 1000000, 1000001, 1000010, 1000011, 1000100, 1000101, 1000110, 1001000, 1001010, 1001100, 1010000

Offset: 1

Author

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

Keywords

• base
• nonn

Comments

Generated with DrScheme.

Examples

			101001020100101^2 = 10201206061261006216060210201.
		

Links

• Jonathan Wellons, Table of n, a(n) for n = 1..1418
• J. Wellons, Tables of Shared Digits [archived]

Programs

Mathematica

With[{c={0,1,2,6}},Select[FromDigits/@Tuples[c,7],SubsetQ[c, IntegerDigits[ #^2]]&]] (* Harvey P. Dale, Jul 04 2019 *)