OFFSET
1,1
COMMENTS
See A094133 for links, references and more information.
Whereas a list of the possible x-values can be established by a brute-force search, this is not possible for the y-values. Some, however, may easily be excluded. For example, 4 cannot occur in this sequence, since for even y, x must be odd, and for x = 2k - 1, x^4 + 4^x = (x^2 + 2^k*x + 2^x)(x^2 - 2^k*x + 2^x).
CROSSREFS
KEYWORD
nonn
AUTHOR
M. F. Hasler, Jul 04 2009
EXTENSIONS
More terms from Jinyuan Wang, Mar 03 2020
STATUS
approved