A136987 Numbers k such that k and k^2 use only the digits 1, 2, 4 and 5.

1, 2, 5, 11, 12, 15, 21, 112, 211, 145415, 11145511

Offset

1,2

Comments

Generated with DrScheme.

No additional terms < 10^39. - Michael S. Branicky, Jul 05 2021

Links

Table of n, a(n) for n=1..11.

Jonathan Wellons, Tables of Shared Digits [archived]

Example

145415^2 = 21145522225.

Mathematica

With[{c={1, 2, 4, 5}}, Select[Flatten[Table[FromDigits/@Tuples[c, n], {n, 10}]], SubsetQ[c, IntegerDigits[#^2]]&]] (* Harvey P. Dale, Sep 15 2019 *)

Crossrefs

Sequence in context: A136968 A136991 A136989 * A231336 A283473 A062889

Adjacent sequences: A136984 A136985 A136986 * A136988 A136989 A136990

Keyword

base,nonn,more

Author

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

Status

approved