198000

Appears in sequences

• a(n) = A000407(n) - A086984(n).at n=5A086985
• Smallest k such that the partial sums of the divisors of k (taken in increasing order) contain exactly n primes.at n=24A187822
• Number of -n..n arrays x(0..3) of 4 elements with zero sum and nonzero second differences.at n=32A200554
• Number of n X n 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 0 1 1 vertically.at n=6A208063
• Number of n X 7 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 0 1 1 vertically.at n=6A208068
• Number of 7Xn 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 0 1 1 vertically.at n=6A208072
• Triangle read by rows T(n,k): number of undirected cycles of length k in the complete tripartite graph K_{n,n,n} (n = 1...; k = 3..3n).at n=26A296546
• Numbers with exactly four distinct exponents in their prime factorization, or four distinct parts in their prime signature.at n=10A323025
• Obverse convolution (n)**(n(n+1)/2); see Comments.at n=5A374892
• Triangle read by rows: T(n,k) = numerators of "across the board" style tournament payouts.at n=41A388733