239263

Properties

Appears in sequences

• a(n) is the smallest number having n as the largest number of distinct prime factors of any term in its 3x+1 trajectory.at n=7A087975
• Primes that are the concatenation p|q of two primes p and q with the same number of digits, where r = (p+q)/2, r|q and p|r are all primes.at n=16A358420
• Prime numbersat n=21162