A374421 a(n) is the smallest number which can be represented as the sum of 3 distinct positive n-th powers in exactly 2 ways, or -1 if no such number exists.
8, 62, 1009, 6578, 1375298099, 160426514
Offset: 1
Examples
a(5) = 1375298099 = 3^5 + 54^5 + 62^5 = 24^5 + 28^5 + 67^5. a(6) = 160426514 = 3^6 + 19^6 + 22^6 = 10^6 + 15^6 + 23^6.
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