30585

Appears in sequences

• Numbers n such that 6n and 12n are both the average of twin prime pairs.at n=37A177680
• G.f.: exp( Sum_{n>=1} A203414(n)*x^n/n ) where A203414(n) = n*Pell(n)*Sum_{d|n} 1/(d*Pell(d)).at n=11A203413
• a(n) is the index of the partition that contains the divisors of n in the list of colexicographically ordered partitions of the sum of the divisors of n.at n=26A299773
• a(n) = 2*p(n)*p(n+2) - p(n+1)^2 where p(k) = k-th prime.at n=39A324795
• Number of pairwise coprime compositions of n, where a singleton is not considered coprime unless it is (1).at n=23A337462
• G.f. satisfies A(x) = 1 + x*A(x)^2 / (1 - x*A(x)^2)^2.at n=7A367237