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

Author

Ilya Gutkovskiy, Jul 02 2024

Keywords

• sign
• more

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.
		

Crossrefs

Cf. A349764, A374256, A374271, A374272.

Extensions

a(7) from Michael S. Branicky, Jul 09 2024