48789domain: NAppears in sequencesNumbers n such that n+(n+1), n^2+(n+1)^2, n+(n+1)^2, n^2+(n+1) are all prime.at n=40A216270Sum of the smallest parts of the partitions of 4n into 4 parts.at n=24A238702a(n) = Sum_{d|n} d^gcd(d,n/d).at n=35A344461