115547domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes in A126554.at n=15A126555In the '3x+1' problem, primes which as starting values set new records for number of steps to reach 1, where a step means either 'divide by two' or 'triple plus one and then divide by two'.at n=28A244638Prime numbersat n=10916