55645

Appears in sequences

• Numbers n such that phi(n + phi(n)) = sigma(n).at n=22A074874
• Numbers k such that (86*10^k - 311)/9 is prime.at n=21A293911
• Number of 6Xn 0..1 arrays with every element equal to 0, 1 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=11A302168
• Coefficients of polynomials g_b(x) that arise in the generating function for rooted maps (A053979).at n=13A305873