232207domain: NPropertiesPrimalityPrimeyesAppears in sequencesThe first primes in centuries with three primes.at n=14A157131Numbers m such that gcd(s1,s2) = number of the Collatz iterations of m where s1 is the sum of the odd terms and s2 the sum of the even terms in the Collatz trajectory.at n=29A281195Prime numbersat n=20617