239233

Properties

Appears in sequences

• List of pairs of primes in reverse order.at n=25A007797
• Let Dedekind's psi(m) = product of (p+1)p^(e-1) for primes p, where p^e is a factor of m. Iterating psi(m) eventually results in a number of form 2^a*3^b. a(n) is the smallest number that requires n steps to reach such a number.at n=9A019268
• Smallest prime p such that n applications of f lead form p to 2, where f is the mapping of primes > 2 to primes defined by A052248.at n=18A080190
• Primes formed by concatenating a prime with the preceding prime.at n=8A088784
• Consecutive prime pairs which after concatenation are prime (ascending or descending order).at n=16A133986
• Primes that are a concatenation of consecutive primes in two ways.at n=3A154531
• Primes formed from concatenating nextprime(n) and n.at n=22A280357
• Prime numbersat n=21158