44969

Appears in sequences

• Semiprimes with semiprime digits (digits 4, 6, 9 only).at n=37A107342
• Breadth-first reading of the subtree rooted at 7 of the tree where each parent node is the arithmetic derivative (A003415) of all its children.at n=43A327977
• Semiprimes with only semiprime digits, each appearing at least once.at n=16A349275
• G.f. satisfies A(x) = 1 + x*A(x) + x^5*A(x)^5.at n=16A364522