A374418 a(n) is the smallest number which can be represented as the sum of 2 distinct positive n-th powers in exactly 3 ways, or -1 if no such number exists.

7, 325, 87539319

Offset

1,1

Comments

See also comments in A338799.

Links

Table of n, a(n) for n=1..3.

Wikipedia, Lander, Parkin, and Selfridge conjecture

Example

a(2) = 325 = 1^2 + 18^2 = 6^2 + 17^2 = 10^2 + 15^2.
a(3) = 87539319 = 167^3 + 436^3 = 228^3 + 423^3 = 255^3 + 414^3.

Crossrefs

Cf. A046881, A338799, A374421, A374422, A374423, A374424, A374425.

Sequence in context: A163437 A109059 A002000 * A092588 A049686 A177019

Adjacent sequences: A374415 A374416 A374417 * A374419 A374420 A374421

Keyword

nonn,bref,hard,more

Author

Ilya Gutkovskiy, Jul 08 2024

Status

approved