OFFSET
1,1
EXAMPLE
2 = 2^0 + 3^0;
47 = 2^7 - 3^4;
53 cannot be written as |2^m+/-3^n| up to m = 30 and n = 19.
CROSSREFS
KEYWORD
nonn
AUTHOR
Lei Zhou, Jan 26 2005
EXTENSIONS
Edited and extended by Robert G. Wilson v, Jan 26 2005
STATUS
approved