A136986 Numbers k such that k and k^2 use only the digits 1, 2 and 4.

1, 2, 11, 12, 21

Offset: 1

Author

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

Keywords

• base
• fini
• full
• nonn

Comments

Sequence terminates.

Generated with DrScheme.

Examples

			21^2 = 441.
		

Links

• Jonathan Wellons, Tables of Shared Digits [archived]

Crossrefs

Cf. A137002.

Programs

Mathematica

Table[Select[(FromDigits/@Tuples[{1,2,4},d]),SubsetQ[{1,2,4},IntegerDigits[ #^2]]&],{d,2}]//Flatten (* Harvey P. Dale, Jan 10 2022 *)