Hmmm. It's a very clever problem, but I am getting different answers!
I am as well. For example, for n = 100, I get 4 (out of 7) bits set.
Chris -- Yes, exactly.
Let me check. Thanks.
Should be 'triple summations', sorry for that.
The Tower of Hanoi
Sum the Infinite Series
Sum the entries of each column of a matrix which satisfy a logical condition.
Easy Sequences 12: 50th Prime
Easy Sequences 16: Volume of Embedded Octahedron
Easy Sequences 36: Hyperbolic Lattice Points
Easy Sequences 31: N-N's Sequence
Easy Sequences 25: Product of Series
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