230280domain: NAppears in sequencesNumbers k such that k+1, 2k+1, 3k+1, 4k+1, 5k+1 are five primes.at n=8A237190Sequence lists numbers k > 1 such that k^2 == phi(k) (mod sigma(k)), where phi = A000010 and sigma = A000203.at n=31A324214