A341327 The spiral numbers not covered by any square in the square spiral tiling of A341160.

6, 19, 28, 29, 53, 54, 61, 62, 63, 86, 87, 114, 115, 116, 117, 161, 162, 163, 164, 185, 186, 187, 188, 189, 227, 228, 229, 230, 231, 232, 244, 245, 246, 247, 248, 311, 312, 313, 314, 315, 407, 408, 409, 410, 411, 412, 413, 771, 772, 773, 774, 775, 776, 777, 778, 779, 866, 867, 868, 869, 870, 871

Offset: 1

Author

Scott R. Shannon, Feb 09 2021

Keywords

• nonn

Comments

See A341160 for an image of the square spiral tiling which shows the uncovered numbers in black.

Examples

			a(1) = 6 and a(2) = 19 as the first, third, fourth, and seventh square of A341160 cover the numbers (1), (5,18), (7,20), (40) respectively which leaves a gap containing numbers 6 and 19 which cannot be covered by any subsequence square.
		

Crossrefs

Cf. A341160, A340974, A174344, A274923, A296030, A275161.