42311

Appears in sequences

• Least odd number k such that x' = k has n solutions, where x' is the arithmetic derivative (A003415) of x.at n=39A189560
• Numbers which can be decomposed as p*q + q*r + r*p (where p < q < r are distinct primes) in more ways than any smaller number.at n=16A237992
• a(n) = Sum from "least x such that prime(x) has n digits" to "the number of primes with n digits" of the difference between prime(k) and k.at n=2A261806
• Indices where A092243 strictly changes sign.at n=25A269737
• a(1) is 4. a(n) is the least semiprime q (A001358) greater than p = a(n-1), such that p/q is a new minimum.at n=12A277343
• a(n) is the least number that can be written in exactly n ways as p*q + q*r + p*r where (p,q,r) is an unordered triple of distinct primes.at n=38A356457