|
|
A136969
|
|
Numbers k such that k and k^2 use only the digits 1, 2, 3, 4 and 6.
|
|
1
|
|
|
1, 2, 4, 6, 11, 12, 21, 46, 111, 121, 146, 162, 462, 642, 1111, 1146, 1632, 3621, 3642, 4611, 4631, 6642, 11142, 11146, 33632, 34121, 36361, 36642, 46111, 211262, 211332, 334162, 362162, 364231, 461642, 641344, 642131, 643142, 664162, 1111132, 1123131, 1123444, 1124332, 1623642, 1623646, 3334162, 3336332, 3363646, 3621344, 3636361, 4622361
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
COMMENTS
|
Generated with DrScheme.
|
|
LINKS
|
|
|
EXAMPLE
|
642126246413621^2 = 412326116333246316164614331641.
|
|
MATHEMATICA
|
With[{c={1, 2, 3, 4, 6}}, Select[Flatten[Table[FromDigits/@Tuples[c, n], {n, 7}]], SubsetQ[ c, IntegerDigits[#^2]]&]] (* Harvey P. Dale, Jan 31 2021 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
base,nonn
|
|
AUTHOR
|
Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008
|
|
STATUS
|
approved
|
|
|
|