61845

Appears in sequences

• Odd numbers with exactly 5 distinct prime factors.at n=31A046391
• Triangle read by rows: T(n,k) = number of labeled acyclic digraphs with n nodes, containing exactly n+1-k points of in-degree zero (n >= 1, 1<=k<=n).at n=23A058876
• Number of labeled acyclic digraphs with n nodes containing exactly n-2 points of in-degree zero.at n=4A060337
• Numbers m with odd length such that sigma(m) = (d_1^d_2)*(d_3^d_4) *...*(d_(k-2)^d_(k-1))*d_k where d_1 d_2 ... d_k is the decimal expansion of m.at n=1A112015
• Numerator of Euler(n, 7/22).at n=4A156880
• Triangle, read by rows, that transforms rows into diagonals in the table of coefficients of successive iterations of x+x^2 (cf. A122888).at n=31A166900
• Column 3 of triangle A166900.at n=4A166903
• Triangle read by rows: coefficients eta(n,k) arising from the study of completely transitive graphs on n nodes.at n=18A259970
• Triangular array read by rows. T(n,k) is the number of labeled directed acyclic graphs on [n] with exactly k nodes of indegree 0.at n=33A361718