291919domain: NAppears in sequencesComposite numbers k for which k - phi(k) divides k-1.at n=29A160599Numbers of the form k^3+k^2+k+1 that are the product of two distinct primes.at n=7A176070Semiprimes of the form n^3 + n^2 + n + 1.at n=8A237627