43919

Appears in sequences

• Numbers k such that k^k == -1 (mod phi(k)).at n=9A177012
• Sum of the eccentricities of all vertices in the Lucas cube Lambda(n).at n=17A248086
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 601", based on the 5-celled von Neumann neighborhood.at n=34A272824
• (1/8) * number of ways to select 3 distinct points forming a triangle of unsigned area = 1 from a square of grid points with side length n.at n=23A320544
• Numbers that equal to the sum of their iterated absolute Möbius divisor function (A173557).at n=17A333873