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.

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

Offset: 7

Author

M. F. Hasler, Dec 17 2014

Keywords

• nonn
• more
• hard

Comments

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

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.