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.
Project Euler: Problem 4, Palindromic numbers
Energy of a photon
Find a subset that divides the vector into equal halves
Numbers on 7-segment
Count trailing zeros in a primorial
Identify eban numbers
Count the ways pairs of parentheses can be matched correctly
Compute the nth Naerogahtyp emirp
Compute the Euler totient function
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