A374228 - OEIS

A374228

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

10, 90, 1521, 300834

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..4.

EXAMPLE

a(3) = 1521 = 1^3 + 2^3 + 8^3 + 10^3 = 1^3 + 4^3 + 5^3 + 11^3 = 4^3 + 6^3 + 8^3 + 9^3.

CROSSREFS

Cf. A025417, A025421, A146756, A374226, A374227.

Sequence in context: A243106 A046706 A337867 * A116348 A043088 A175710

Adjacent sequences: A374225 A374226 A374227 * A374229 A374230 A374231

KEYWORD

nonn,hard,more

AUTHOR

Ilya Gutkovskiy, Jul 01 2024

STATUS

approved