127227

Appears in sequences

• Concatenations of pairs of primes that differ by 100.at n=9A103523
• Triangle read by rows: T(n,k) is the number of ordered trees with n edges and having k vertices of outdegree 2 that have (two) leaves as their (two) children.at n=31A178519
• Number of ordered trees with n edges and with no vertex of outdegree 2 that have two leaves as their two children.at n=12A178520