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.
vectorization in N
Bang Bang in Bangalore
Add more zeros
Pi Estimate 1
Easy Sequences 20: Counting Prime-sided Rectangles
Easy Sequences 21: Combinatorial Summations
Easy Sequences 35: Cutting a donut to Semi-prime pieces
Easy Sequences 10: Sum of Cumsums of Fibonacci Sequence
Easy Sequences 2: Trigonometric function with integral input and output
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