18428

Appears in sequences

• Number of unlabeled distributive lattices on n nodes.at n=20A006982
• Row sums of A051598.at n=12A053209
• n+p(n)+p(p(n)) is a square, where p(n) is the n-th prime.at n=9A116011
• a(n) = 16*n^2 - 2*n.at n=33A158058
• Expansion of (1+5*x+7*x^2-x^3)/((1-2*x^2)*(1-x)*(1+x)).at n=23A224692
• Numbers n such that n^2 is a sum of 2 and also of 4 consecutive primes.at n=19A252066
• Lychrel numbers k that set a new record for the number of 'Reverse and Add' steps in base 2 needed to reach a Lychrel number m < k (i.e., its seed).at n=13A306481
• Sum of lengths of SB (shortest border) factorizations over all binary strings of length n.at n=12A330886