OFFSET
1,1
COMMENTS
A squarefree subsequence of Leyland numbers (which are numbers that can be written as a^b + b^a for a, b > 1).
EXAMPLE
57 = 3*19 = 5^2 + 2^5.
2012174 = 2*1006087 = 9^5 + 5^9.
4486784401 = 11*407889491 = 10^9 + 9^10.
2552470327702 = 2*1276235163851 = 13^9 + 9^13.
CROSSREFS
KEYWORD
nonn
AUTHOR
Massimo Kofler, Aug 07 2022
STATUS
approved