43954

Appears in sequences

• Numbers n such that sigma(n) = reversal(n+2).at n=3A230021
• Numbers n such that n = reversal(sigma(n)) - 2.at n=3A230768
• Molien series for invariants of finite Coxeter group D_12 (bisected).at n=42A266775
• Matula-Goebel numbers of unlabeled rooted identity RPMG-trees, meaning the Matula-Goebel numbers of the branches of any non-leaf node are relatively prime.at n=21A316469
• a(1) = 1; a(2) = 2; a(n + 1) = 2 * prime(a(n)).at n=6A331937
• Matula-Goebel tree number of tree n with a new leaf added below each existing vertex.at n=30A348067