2772409domain: NPropertiesPrimalityPrimeyesAppears in sequencesInitial prime of exactly nine consecutive primes congruent to 1 modulo 4.at n=19A162865Least prime starting a run of n consecutive primes p_i, i=1..n, such that p_i + 1 is squarefree and p_(n+1) + 1 is not squarefree.at n=8A373618Prime numbersat n=201513