Johannes
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 Apr 10 revised What's problematic about finding out if a large number is Prime or not? Primality checking vs decomposing into prime factors Apr 10 comment What's problematic about finding out if a large number is Prime or not? @RamchandraApte - good point, have modified my answer to clarify this. Apr 10 revised What's problematic about finding out if a large number is Prime or not? Primality checking vs decomposing into prime factors Apr 10 revised What's problematic about finding out if a large number is Prime or not? added 313 characters in body Apr 10 answered What's problematic about finding out if a large number is Prime or not? Apr 9 suggested rejected edit on why the Eigen values of given matrix P are of modulus $1$? Dec 9 awarded Yearling Oct 18 awarded Nice Question Feb 21 asked Nearest Pythagorean Partners Feb 15 revised Finding the formula for the number of golf balls in a triangular pyramid with $n$ layers. Edited incorrect info (n-th layer vs n-layer) Feb 15 suggested approved edit on Finding the formula for the number of golf balls in a triangular pyramid with $n$ layers. Feb 14 revised Pythagorean rectilinear polygons added 2 characters in body Feb 14 revised Pythagorean rectilinear polygons added 3 characters in body Feb 14 revised Pythagorean rectilinear polygons added 3 characters in body Feb 14 comment Pythagorean rectilinear polygons @Henry - yes, all Euclidean distances (including the diagonal distances) need to be integer. Have modified the problem statement to stress this point. Thanks. Feb 14 revised Pythagorean rectilinear polygons added 5 characters in body Feb 14 revised Pythagorean rectilinear polygons added 17 characters in body Feb 14 asked Pythagorean rectilinear polygons Dec 27 comment Why do some authors write dx after integral sign? I guess - depending on the application - physicists prefer keeping the differential adjacent to the integral sign as it stresses the operator nature of integration. Dec 27 revised Easy example why complex numbers are cool Concluding sentence