A136994 Numbers k such that k and k^2 use only the digits 1, 2, 4, 6 and 8.

1, 2, 4, 8, 11, 12, 21, 22, 41, 46, 68, 121, 122, 162, 168, 221, 261, 262, 642, 668, 1488, 4262, 6441, 6642, 6668, 8162, 8261, 11141, 11142, 14881, 66668, 81662, 121168, 148868, 248222, 248642, 664162, 664441, 666668, 684262, 828622, 1124662, 1188142, 1618222, 2118222, 2148122, 2148642, 4261668, 4628622, 6422182, 6644162, 6666668, 11142122

Offset

1,2

Comments

Generated with DrScheme.

Links

Jonathan Wellons, Table of n, a(n) for n = 1..442

J. Wellons, Tables of Shared Digits [archived]

Example

681824624246168^2 = 464884818228428184142262684224.

Mathematica

With[{c={1, 2, 4, 6, 8}}, Table[Select[FromDigits/@Tuples[c, n], SubsetQ[ c, IntegerDigits[ #^2]]&], {n, 8}]]//Flatten (* Harvey P. Dale, Apr 13 2018 *)

Crossrefs

Sequence in context: A028846 A274924 A080152 * A137288 A247524 A116443

Adjacent sequences: A136991 A136992 A136993 * A136995 A136996 A136997

Keyword

base,nonn,changed

Author

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

Status

approved