|
Search: id:A108705
|
|
|
| A108705 |
|
Numbers n such that a^n + b^n + c^n + ... is a square, where a*b*c* ... is the prime factorization of n. |
|
+0
1
|
| |
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
No more terms through 630000. - Ryan Propper (rpropper(AT)stanford.edu), May 12 2006
|
|
EXAMPLE
|
16 is in the sequence because 16 = 2^4 and 2^16 + 2^16 + 2^16 + 2^16 = 262144
= 512^2.
|
|
CROSSREFS
|
Cf. A082872.
Sequence in context: A019317 A067566 A067555 this_sequence A113933 A127871 A109210
Adjacent sequences: A108702 A108703 A108704 this_sequence A108706 A108707 A108708
|
|
KEYWORD
|
hard,nonn
|
|
AUTHOR
|
Jason Earls (zevi_35711(AT)yahoo.com), Jun 20 2005
|
|
EXTENSIONS
|
Two more terms from Ryan Propper (rpropper(AT)stanford.edu), May 12 2006
|
|
|
Search completed in 0.002 seconds
|
