OFFSET
1,1
COMMENTS
a(7) > 10^11. - Sean A. Irvine, Feb 24 2024
REFERENCES
R. K. Guy, Unsolved Problems in Number Theory, D9.
EXAMPLE
3^2-2^3=2^0, 5^2-3^2=2^4, 3^3-5^2=2, 3^4-7^2=2^5, 5^3-11^2=2^2, 71^2-17^3=2^7.
CROSSREFS
KEYWORD
hard,nonn
AUTHOR
Naohiro Nomoto, Mar 27 2002
STATUS
approved