47489domain: NAppears in sequencesA060448 sorted and duplicates removed.at n=31A060636Positive numbers y such that y^2 is of the form x^2+(x+281)^2 with integer x.at n=10A157348Numerator of the rational coefficient at the first power of Pi in Sum_{k>0} (sin(k)/k)^n.at n=11A274040