56914

Appears in sequences

• Number of rooted maps with n edges on torus.at n=4A006300
• a(n) = p(1)p(n) + p(2)p(n-1) + ... + p(k)p(n-k+1), where k = [ n/2 ], p = A000040, the primes.at n=38A025129
• Numbers k such that 1000k+1, 1000k+3, 1000k+7, 1000k+9 are all primes.at n=22A064962
• The number of trisubstitution products with composition C_n H_(2n-1) X_2 Y.at n=30A159940
• Number of compositions of n avoiding the pattern 111.at n=22A232432
• Triangle T(n,k) read by rows: T(n,k) is the number of rooted genus-k maps with n edges, n>=0, 0<=k<=n.at n=22A238396
• Number of partitions p of n such that floor(mean(p)) or ceiling(mean(p)) is a part.at n=44A241344
• Number of length 1+3 0..n arrays with some pair in every consecutive four terms totalling exactly n.at n=20A245951
• Triangle read by rows: T(n,g) is the number of rooted maps with n edges on an orientable surface of genus g.at n=13A269919