A074980 Numbers which are not of the form m^p - n^q where p = 2 or 3, q = 2 or 3.

6, 10, 14, 34, 42, 46, 50, 58, 62, 66, 70, 78, 82, 86, 90, 102, 110, 114, 122, 130, 134, 158, 162, 166, 178, 182, 194, 202, 206, 210, 214, 226, 230, 234, 238, 246, 250, 254, 258, 266, 274, 278, 290, 302, 306, 310, 314, 322, 326, 330, 338, 354, 358, 374, 378

Offset

1,1

Comments

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

Checked for squares and cubes through 1.134x10^25.

Links

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

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

Example

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

Crossrefs

Cf. A074981.

Sequence in context: A259020 A259021 A171251 * A363172 A059218 A362600

Adjacent sequences: A074977 A074978 A074979 * A074981 A074982 A074983

Keyword

nonn

Author

Zak Seidov, Oct 07 2002

Extensions

Corrected and extended by Jud McCranie, Oct 10 2002

Status

approved