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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, 2, 16, 27, 512, 3125, 65536, 531441
OFFSET
1,2
COMMENTS
No more terms through 630000. - Ryan Propper, 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: A190046 A067566 A067555 * A113933 A127871 A242933
KEYWORD
hard,nonn
AUTHOR
Jason Earls, Jun 20 2005
EXTENSIONS
Two more terms from Ryan Propper, May 12 2006
STATUS
approved