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A252476 Least index k such that n = A252486(k), minimal number of 6th powers that sum to k^6; or a(n)=0 if no such k exists. 2

%I

%S 1141,251,54,39,18,17,16,14,4,13,11

%N Least index k such that n = A252486(k), minimal number of 6th powers that sum to k^6; or a(n)=0 if no such k exists.

%C It is not known whether a(6)>0.

%C Further values are a(19)=9, a(21)=7, a(22)=6, a(29)=5, a(36)=3, a(64)=2. The last of these is most probably the last nonzero term of the sequence.

%K nonn,more,hard

%O 7,1

%A _M. F. Hasler_, Dec 17 2014

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Last modified October 7 12:02 EDT 2022. Contains 357271 sequences. (Running on oeis4.)