Johannes
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 Feb21 asked Nearest Pythagorean Partners Feb15 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) Feb15 suggested approved edit on Finding the formula for the number of golf balls in a triangular pyramid with $n$ layers. Feb14 revised Pythagorean rectilinear polygons added 2 characters in body Feb14 revised Pythagorean rectilinear polygons added 3 characters in body Feb14 revised Pythagorean rectilinear polygons added 3 characters in body Feb14 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. Feb14 revised Pythagorean rectilinear polygons added 5 characters in body Feb14 revised Pythagorean rectilinear polygons added 17 characters in body Feb14 asked Pythagorean rectilinear polygons Dec27 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. Dec27 revised Easy example why complex numbers are cool Concluding sentence Dec27 answered Easy example why complex numbers are cool Dec9 awarded Caucus Dec9 awarded Yearling Sep24 awarded Autobiographer Sep12 awarded Nice Answer Aug31 comment Proof of Gauss' Law of gravitation without reference to Newton? "Where does the 4π come from?" That's Sir Isaac failing to put a factor $4\pi$ in the denominator of the universal law of gravitation. Aug17 revised Binomial triplets added 196 characters in body Aug17 comment Binomial triplets OEIS has listed quite a few tetrahedral numbers that are the sum of two other tetrahedral numbers: oeis.org/A034404 .