|
Search: id:A061910
|
|
|
| A061910 |
|
Numbers n such that sum of digits of n^2 is a square. |
|
+0
11
|
|
| 1, 2, 3, 6, 9, 10, 11, 12, 13, 14, 15, 18, 20, 21, 22, 23, 30, 31, 39, 41, 45, 48, 51, 58, 59, 60, 67, 68, 76, 77, 85, 86, 90, 94, 95, 100, 101, 102, 103, 104, 105, 110, 111, 112, 113, 120, 121, 122, 130, 131, 139, 140, 148, 150, 157, 158, 166, 175, 176, 180, 184, 185
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
EXAMPLE
|
6^2 = 36, and 3+6 = 9 is a square. 13^2 = 169, and 1+6+9 = 16 is a square.
|
|
MAPLE
|
readlib(issqr): f := []: for n from 1 to 200 do if issqr(convert(convert(n^2, base, 10), `+`)) then f := [op(f), n] fi; od; f;
|
|
CROSSREFS
|
Cf. A007953, A004159, A061909, A061911, A061912.
Sequence in context: A021426 A097108 A094351 this_sequence A007086 A047404 A133555
Adjacent sequences: A061907 A061908 A061909 this_sequence A061911 A061912 A061913
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
Asher Auel (asher.auel(AT)reed.edu), May 17 2001
|
|
|
Search completed in 0.003 seconds
|
