A375332 a(n) is the smallest number which can be represented as the sum of 5 distinct positive n-th powers in exactly 4 ways, or -1 if no such number exists.
-1, 151, 2465, 54994, 1386406515, 351060139210
Offset: 1
Examples
a(4) = 54994 = 1^4 + 2^4 + 4^4 + 8^4 + 15^4
= 1^4 + 2^4 + 9^4 + 10^4 + 14^4
= 2^4 + 5^4 + 6^4 + 11^4 + 14^4
= 3^4 + 7^4 + 8^4 + 10^4 + 14^4.
Crossrefs
Extensions
a(5)-a(6) from Michael S. Branicky, Aug 12 2024