A136813 Numbers k such that k and k^2 use only the digits 0, 1, 2, 3 and 7.

0, 1, 10, 11, 100, 101, 110, 111, 1000, 1001, 1010, 1011, 1100, 1101, 1110, 10000, 10001, 10010, 10011, 10100, 10101, 10110, 10111, 11000, 11001, 11010, 11100, 11101, 100000, 100001, 100010, 100011, 100100, 100101, 100110, 100111, 101000, 101001, 101010, 101011, 101100, 101110, 110000, 110001, 110010, 110100, 110101, 111000, 111001, 111010

Offset: 1

Author

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

Keywords

• base
• nonn

Comments

Generated with DrScheme.

Examples

			3711303010100^2 = 13773770032777320702010000.
		

Links

• Jonathan Wellons, Table of n, a(n) for n = 1..1411
• J. Wellons, Tables of Shared Digits [archived]

Programs

Mathematica

With[{c={0,1,2,3,7}},Select[FromDigits/@Tuples[c,6],SubsetQ[c,IntegerDigits[#^2]]&]] (* Harvey P. Dale, Apr 12 2024 *)