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.
Determine if a Given Number is a Triangle Number
letter yes yes & letter no no
How to subtract?
Rotate a Matrix by 90 degrees
Solve Quadratic : No * - or key functions permitted
Easy Sequences 17: Mu Variant Function
Easy Sequences 46: Semi-prime Leap Year Pairs
Easy Sequences 22: Sum of Proper Fractions
Easy Sequences 26: Prime-Integer Line Segments
Easy Sequences 48: Prime Big Omega of Factorial Sequence
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