38689

Appears in sequences

• [ n(n-1)(n-2)(n-3)/17 ].at n=30A011927
• Numbers k such that 50*R_k + 9 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=13A056687
• Numbers n such that 7*3^n - 2 is prime.at n=34A058605
• Number of n-length words w over a 3-ary alphabet such that w is empty or a prefix z concatenated with letter a_i and i=1 or 0 < #(z,a_{i-1}) >= #(z,a_i), where #(z,a_i) counts the occurrences of the i-th letter in z.at n=12A240609
• Number of directed multigraphs with loops containing n edges and an infinite number of vertices modulo isomorphism and reversal of all edge directions.at n=7A364088