61920

Appears in sequences

• a(0) = 1, a(n) = 480*sigma_7(n).at n=2A008410
• Sum of the unitary divisors of n!.at n=7A064028
• Expansion of (1-x)/(1-2*x-2*x^2-2*x^3).at n=11A077843
• Duplicate of A077843.at n=11A077994
• Numbers k such that 2^k - 1 is divisible by (k-1).at n=35A087965
• a(0) = 1, a(n) = 20*sigma[3](n).at n=14A091983
• Octagonal numbers which are the sums of exactly two positive octagonal numbers.at n=27A136346
• Numbers with prime factorization pqr^2s^5.at n=32A190293
• Molecular topological indices of the sun graphs.at n=23A192845
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 345", based on the 5-celled von Neumann neighborhood.at n=7A271294
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 643", based on the 5-celled von Neumann neighborhood.at n=35A273314
• Maximum number of induced copies of the claw graph K_{1,3} in an n-node graph.at n=42A352666
• Square array read by antidiagonals: the n-th row lists n-gonal numbers that are products of smaller n-gonal numbers.at n=42A374370
• Numbers k for which sigma(k - x) + sigma(k + x) = 8*k has at least one nonnegative solution.at n=37A384841