1023871domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p followed by a gap of 70 = nextprime(p) - p.at n=23A204792In 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=35A244638Prime numbersat n=80258