127326domain: NAppears in sequencesNumbers k for which A064380(k) = k/2.at n=34A185078Numbers k such that (2^64 - 189)*10^k + 1 is prime.at n=15A209250Numbers k such that iphi(k) divides k, where iphi is the infinitary Euler phi function (A064380).at n=35A373057