|
|
A136917
|
|
Numbers k such that k and k^2 use only the digits 0, 2, 5, 7 and 9.
|
|
1
|
|
|
0, 5, 27, 50, 77, 95, 270, 500, 505, 527, 755, 770, 950, 995, 2700, 2755, 5000, 5005, 5027, 5050, 5077, 5095, 5205, 5270, 7227, 7550, 7700, 9500, 9950, 9995, 22577, 27000, 27005, 27550, 50000, 50005, 50027, 50050, 50077, 50095, 50270, 50500, 50505, 50527, 50705, 50770, 50950, 52050, 52700, 72270, 75500, 77000, 77005, 95000, 95005, 97505, 99500
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
COMMENTS
|
Generated with DrScheme.
|
|
LINKS
|
|
|
EXAMPLE
|
52527097505^2 = 2759095972299777225025.
|
|
MATHEMATICA
|
With[{c={0, 2, 5, 7, 9}, digs=5}, Select[FromDigits/@Tuples[ c, digs], SubsetQ[ c, IntegerDigits[ #^2]]&]] (* Harvey P. Dale, Sep 29 2018 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
base,nonn
|
|
AUTHOR
|
Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008
|
|
STATUS
|
approved
|
|
|
|