105554

Appears in sequences

• Number of proper factorizations of p1^n*p2^2, where p1 and p2 are distinct primes.at n=30A031125
• Number of partitions of n minus number of divisors of n.at n=45A144300
• Numbers n such that (4 * 6^n + 1)/5 is prime.at n=25A248613
• First lower diagonal of Parker's triangle A047812.at n=43A335323
• Number A(n,k) of k-tuples (p_1, p_2, ..., p_k) of Dyck paths of semilength n, such that each p_i is never below p_{i-1} and the upper path p_k only touches the x-axis at its endpoints; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=60A378112
• Number of n-tuples (p_1, p_2, ..., p_n) of Dyck paths of semilength n, such that each p_i is never below p_{i-1} and the upper path p_n only touches the x-axis at its endpoints.at n=5A378113