64421

Appears in sequences

• Numbers n such that there are exactly 4 primes p such that floor(n*log(n))+1<=p<=floor((n+1)*log(n+1))-1.at n=18A068362
• Numbers k such that 7*R_(k+2) - 2*10^k is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=19A257031
• Number of even parts in the partitions of n into 10 parts.at n=49A309662