A396126 Consider the square spiral with its cells numbered starting at 0. Five players take turns and place knights at the smallest unoccupied cell not attacked by an existing knight of a different player. Sequence lists squares occupied by the fifth player.

20, 36, 38, 45, 60, 64, 71, 96, 98, 104, 110, 138, 143, 146, 152, 159, 175, 182, 192, 196, 198, 209, 244, 248, 252, 254, 266, 272, 312, 316, 323, 330, 334, 338, 345, 373, 380, 392, 400, 402, 406, 413, 419, 456, 470, 474, 478, 480, 482, 492, 496, 500, 506, 543

Offset

1,1

Links

Rémy Sigrist, Table of n, a(n) for n = 1..10000

Rémy Sigrist, PARI program

Prog

(PARI) \\ See Links section.

Crossrefs

Cf. A392177, A396122, A396123, A396124, A396125, A396127, A396128.

Sequence in context: A326403 A335251 A135801 * A396133 A078210 A174628

Adjacent sequences: A396123 A396124 A396125 * A396127 A396128 A396129

Keyword

nonn

Author

Rémy Sigrist, May 22 2026

Status

approved