A375329 a(n) is the smallest number which can be represented as the sum of 5 distinct positive n-th powers in exactly 3 ways, or -1 if no such number exists.
18, 127, 1548, 16834, 70211956, 342172570
Offset: 1
Examples
a(6) = 342172570 = 4^6 + 5^6 + 18^6 + 20^6 + 25^6
= 8^6 + 10^6 + 11^6 + 23^6 + 24^6
= 8^6 + 13^6 + 15^6 + 16^6 + 26^6.
Comments