29993

Appears in sequences

• Integers k such that R(k+7) = 3.at n=3A086943
• Numbers n such that phi(n) + sigma(n) = (3/2)*reversal(n).at n=1A230013
• 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=37A327977
• a(n) = number of isogeny classes of abelian surfaces over the finite field of order prime(n).at n=45A362198