A374270 a(n) is the smallest number which can be represented as the sum of n distinct n-th powers of primes in exactly 2 ways, or -1 if no such number exists.
-1, 410, 185527, 6539044, 2250298051, 1397942436813, 56190747296833091
Offset: 1
Examples
a(2) = 410 = 7^2 + 19^2 = 11^2 + 17^2. a(3) = 185527 = 13^3 + 43^3 + 47^3 = 19^3 + 31^3 + 53^3.
Extensions
a(7) from Michael S. Branicky, Jul 09 2024