30746

Appears in sequences

• Number of divisor chains of length n in which the first term is a divisor of n(n+1)/2 ("cyclic" divisor chains).at n=30A094098
• Number of n-length words w over binary alphabet such that for every prefix z of w we have #(z,a_i) = 0 or #(z,a_i) >= #(z,a_j) for all j>i and #(z,a_i) counts the occurrences of the i-th letter in z.at n=17A213290
• Number of length 4 0..n arrays with each partial sum starting from the beginning no more than one standard deviation from its mean.at n=16A244792
• Partial sums of A255745.at n=23A255766
• a(n) = sigma(prime(n)^n) - phi(prime(n)^n).at n=4A271440