A374269 - OEIS

A374269

a(n) is the smallest number which can be represented as the sum of n distinct positive n-th powers in exactly 4 ways, or -1 if no such number exists.

-1, 1105, 13896, 300834, 1386406515, 2063792939

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OFFSET

1,2

LINKS

EXAMPLE

a(2) = 1105 = 4^2 + 33^2 = 9^2 + 32^2 = 12^2 + 31^2 = 23^2 + 24^2.

a(3) = 13896 = 1^3 + 12^3 + 23^3 = 2^3 + 4^3 + 24^3 = 4^3 + 18^3 + 20^3 = 9^3 + 10^3 + 23^3.

CROSSREFS

KEYWORD

sign,more

AUTHOR

EXTENSIONS

a(6) from Michael S. Branicky, Jul 09 2024

STATUS

approved