OK, but you can you *derive* that formula?
Does “look up in OEIS” count as “derive”?
Tim: You, William, David, and others have figured me out. I suppose there are worse habits than repeatedly clicking the "Webcam" button on OEIS.
So many choices
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Rotate input square matrix 90 degrees CCW without rot90
Piecewise linear interpolation
Identify primorial primes
List the titles of Cody problems
Find the zeros of the Bessel function of the first kind
Determine the Zeckendorf expansion of a number
Construct a continued fraction for a square root
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