55309

Appears in sequences

• Numbers k such that 6*phi(k) = 5*sigma(k).at n=5A065823
• Maximum cardinality of a subset of Dyck n-paths p that share both the same area and the same maj(beta(p)) statistic.at n=16A193617
• Number of ways to arrange 4 points on an n X n X n triangular grid on an isosceles triangle so that it balances at the midpoint of its central altitude.at n=18A194021
• Composite squarefree numbers n such that each p-sopfr(n) divides n+sopfr(n), where p runs through the prime factors of n, and where sopfr(n) is the sum of the prime factors of n (A001414).at n=5A228303
• Squarefree numbers k such that alpha(k) = lambda(k), where alpha(k) = LCM of all (p+1) for primes p dividing k, and lambda(k) = A002322(k).at n=11A287514