18823

Appears in sequences

• Indices of products of twin primes in the semiprimes.at n=18A131188
• Array read by rows: T(n,k) is the number of directed multigraphs with loops with n arcs, k vertices, and no vertex of degree 0.at n=59A136564
• Number of series-reduced free pure symmetric identity multifunctions (with empty expressions allowed) with one atom and n positions.at n=16A317880
• Maximum length of a finite snake in the Snake Number Problem with n-periodic instructions in an infinite square grid (see Comments).at n=13A353176
• Numbers that can be written as a^2 + 3*b^2 for some a, b in A155716 and also as c^2 + 6*d^2 for some c, d in A092572.at n=15A380295