204765domain: NAppears in sequencesa(n) = Sum_{ d|n } sigma(n/d)*d^4.at n=20A027848Integer part of the blowup factor for A025587(n).at n=17A061523Numbers n such that n^3 +/- 2 and 3*n +/- 2 are all prime.at n=16A268475a(n) = Sum_{d|n} d^4*A000593(n/d).at n=20A288420