A307189 Positions of 1's in the square spiral in A275609.

1, 4, 6, 12, 23, 25, 27, 33, 35, 38, 40, 42, 44, 54, 56, 58, 64, 77, 79, 81, 83, 85, 95, 97, 103, 105, 107, 109, 112, 114, 128, 130, 132, 134, 136, 142, 144, 146, 156, 163, 165, 167, 169, 171, 173, 175, 189, 191, 201, 203, 205, 207, 213, 215, 234, 236, 238

Offset: 1

Author

N. J. A. Sloane, Mar 28 2019

Keywords

• nonn

Links

• Alois P. Heinz, Table of n, a(n) for n = 1..20000 (first 1249 terms from N. J. A. Sloane)
• Rémy Sigrist, Colored scatterplot of (x,y) such that A275609(x,y) = 1 and -500 <= x <= 500 and -500 <= y <= 500 (where the color is function of (x mod 2) + 2 * (y mod 2))

Crossrefs

Cf. A275609, A307188, A307190, A307191, A307192.