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.
Find the numeric mean of the prime numbers in a matrix.
Energy of a photon
Numbers with prime factors 2, 3 and 5.
Parse string and identify specific string sequence in algebraic equation
Replicate elements in vectors
Easy Sequences 14: Consecutive Composites
Easy Sequences 33: Web Trapped Ant
Easy Sequences 2: Trigonometric function with integral input and output
Easy Sequences 21: Combinatorial Summations
Easy Sequences 15: Pythagorean Area with maximum Hypotenuse
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