87811

Properties

Appears in sequences

• Number of unlabeled rooted trees with n nodes (or connected functions with a fixed point).at n=15A000081
• Inverse WEIGH transform of A038000.at n=28A038001
• First term of strong prime sextets: p(m+1)-p(m) > p(m+2)-p(m+1) > p(m+3)-p(m+2) > p(m+4)-p(m+3) > p(m+5)-p(m+4).at n=28A054813
• Bisection of A000081 (odd part).at n=7A100427
• Number of trivially-perfect graphs on n nodes.at n=13A123467
• Numbers k such that k and k^2 use only the digits 0, 1, 2, 7 and 8.at n=22A136832
• Irregular triangle read by rows: T(n,k), n >= 2, 1 <= k <= n/2, = number of rooted forests with n nodes and k trees, with at least two nodes in each tree.at n=49A174135
• Primes in A000081.at n=2A185667
• Partial sums of the Floor-Sqrt transform of Catalan numbers.at n=19A192633
• Primes of the form 4n^3 + 3.at n=6A199365
• Primes of the form 7n^2 + 3.at n=9A201604
• Number of partitions of n such that 2*(greatest part) > (number of parts).at n=45A237754
• a(n) = (n^2 + 1) * 5^n + (n^2 + 2) * 3^n.at n=5A304578
• Prime numbersat n=8528