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

1, 2, 11, 12, 21

Offset

1,2

Comments

Sequence terminates.

Generated with DrScheme.

Links

Table of n, a(n) for n=1..5.

Jonathan Wellons, Tables of Shared Digits [archived]

Example

21^2 = 441.

Mathematica

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

Crossrefs

Cf. A137002.

Sequence in context: A110126 A125020 A065020 * A096109 A136997 A085184

Adjacent sequences: A136983 A136984 A136985 * A136987 A136988 A136989

Keyword

base,fini,full,nonn

Author

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

Status

approved