cp's OEIS Frontend

A375331 a(n) is the smallest number which can be represented as the sum of 4 distinct positive n-th powers in exactly 4 ways, or -1 if no such number exists.

%I A375331 #5 Aug 12 2024 13:10:34
%S A375331 -1,142,4445,300834
%N A375331 a(n) is the smallest number which can be represented as the sum of 4 distinct positive n-th powers in exactly 4 ways, or -1 if no such number exists.
%e A375331 a(4) = 300834 = 1^4 +  4^4 + 12^4 + 23^4
%e A375331               = 1^4 + 16^4 + 18^4 + 19^4
%e A375331               = 3^4 +  6^4 + 18^4 + 21^4
%e A375331               = 7^4 + 14^4 + 16^4 + 21^4.
%Y A375331 Cf. A046881, A342898, A374418, A374421, A374422, A374423, A374424, A374425, A375329, A375330, A375332, A375333, A375334.
%K A375331 sign,hard,more
%O A375331 1,2
%A A375331 _Ilya Gutkovskiy_, Aug 12 2024