181411

Appears in sequences

• Numbers n such that prime(n) == n (mod phi(n)).at n=13A066687
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 0), (0, -1, 1), (1, 0, -1), (1, 0, 1), (1, 1, -1)}.at n=10A149362