125860domain: NAppears in sequencesa(n) = n*(n+1)*(n+2)*(n+3)/6.at n=28A033488Denominators of row 4 of table described in A051714/A051715.at n=26A051723Numbers n such that sigma(n) = 8*phi(n).at n=20A104901Denominators of r(n) := Sum_{k=0..n-1} 1/Product_{j=0..4} (k + j + 1), for n >= 0, with r(0) = 0.at n=27A300299