73443domain: NAppears in sequencesTerms in A061725 that are of form 3*prime.at n=18A133395Semiprimes p such that next semiprime after p is p+20.at n=21A217335Numbers n such that n^2 + 1, (n+1)^2 + 1 and (n+2)^2 + 1 are divisible by a square.at n=12A218048