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.
So many choices
Project Euler: Problem 6, Natural numbers, squares and sums.
Easy Sequences 17: Mu Variant Function
Easy Sequences 13: Average Speed of Spaceship
Easy Sequences 10: Sum of Cumsums of Fibonacci Sequence
Easy Sequences 49: Prime Little Omega Function
Easy Sequences 31: N-N's Sequence
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