643901

Appears in sequences

• 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, -1, 1), (-1, 1, -1), (0, 0, 1), (1, -1, 0), (1, 0, 0)}.at n=12A149830
• Numbers n such that 5^A000010(n) == 1 (mod n^2).at n=7A242959
• Odd numbers k such that the ring of integers of Q(5^(1/k)) is not Z[5^(1/k)].at n=23A342391