|
| |
|
|
A285550
|
|
Numbers k such that the digits of k^2 are squares.
|
|
5
|
|
|
|
0, 1, 2, 3, 7, 10, 12, 20, 21, 30, 38, 70, 97, 100, 102, 107, 120, 138, 200, 201, 210, 212, 300, 380, 648, 700, 701, 951, 970, 997, 1000, 1002, 1007, 1020, 1049, 1070, 1200, 1380, 1393, 2000, 2001, 2010, 2100, 2120, 3000, 3148, 3153, 3451, 3743, 3747, 3800
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,3
|
|
|
LINKS
|
|
|
|
FORMULA
|
|
|
|
MATHEMATICA
|
Sqrt[#]&/@Select[Range[0, 3800]^2, SubsetQ[{0, 1, 4, 9}, IntegerDigits[#]]&] (* Harvey P. Dale, Jun 14 2022 *)
|
|
|
PROG
|
(PARI) maxk=10000; L=List(); for(k=0, maxk, if(setminus(vecsort(digits(k^2), , 8), [0, 1, 4, 9]) == [], listput(L, k))); Vec(L)
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
nonn,base
|
|
|
AUTHOR
|
|
|
|
STATUS
|
approved
|
| |
|
|
