107903domain: NPropertiesPrimalityPrimeyesAppears in sequencesOdd numbers n for which the number of iterations to reach the largest equals number of iterations to reach 1 from the largest in Collatz (3x+1) trajectory of n.at n=36A224533Prime-indexed primes q such that prime(q)-q-1 is a prime indexed prime.at n=28A318751Prime numbersat n=10267