1,1

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.

Cf. A004051. Complement of A007644.

Sequence in context: A073350 A049545 A127566 this_sequence A154363 A049555 A052042

Adjacent sequences: A103143 A103144 A103145 this_sequence A103147 A103148 A103149

nonn

Lei Zhou (lzhou5(AT)emory.edu), Jan 26 2005

Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 26 2005