1,1

This is a famous hard problem and the terms shown are only conjectured values.

Checked for squares and cubes through 1.134x10^25.

Table of n, a(n) for n=1..55.

Alf van der Poorten, Remarks on the sequence of 'perfect' powers

146 is not in the sequence because 146 = 195^3-2723^2.

Cf. A074981.

Sequence in context: A259020 A259021 A171251 * A059218 A095678 A339116

Adjacent sequences: A074977 A074978 A074979 * A074981 A074982 A074983

nonn

Zak Seidov, Oct 07 2002

Corrected and extended by Jud McCranie, Oct 10 2002

approved