A136905 Numbers k such that k and k^2 use only the digits 0, 2, 4, 6 and 9.

0, 2, 20, 64, 200, 264, 492, 640, 964, 2000, 2064, 2640, 4902, 4920, 4992, 6400, 9640, 20000, 20602, 20640, 20992, 24992, 26400, 49020, 49200, 49902, 49920, 49992, 64000, 96400, 200000, 206020, 206400, 209920, 209992, 222402, 246962, 249920, 249992, 264000, 490200, 492000, 494262, 494462, 494662, 499002, 499020, 499200, 499902, 499920, 499992

Offset

1,2

Comments

Generated with DrScheme.

Links

Jonathan Wellons, Table of n, a(n) for n = 1..1278

J. Wellons, Tables of Shared Digits [archived]

Example

49642929029462^2 = 2464420402624200949264009444.

Mathematica

With[{c={0, 2, 4, 6, 9}}, Select[FromDigits/@Tuples[c, 6], SubsetQ[ c, IntegerDigits[ #^2]]&]] (* Harvey P. Dale, Sep 21 2017 *)

Crossrefs

Sequence in context: A133217 A001504 A192351 * A230644 A183907 A216609

Adjacent sequences: A136902 A136903 A136904 * A136906 A136907 A136908

Keyword

base,nonn

Author

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

Status

approved