A307190 Positions of 2's in the square spiral in A275609.

2, 5, 8, 15, 21, 26, 28, 31, 36, 39, 41, 46, 48, 55, 60, 73, 75, 82, 84, 86, 91, 93, 98, 101, 104, 106, 108, 110, 116, 118, 120, 129, 131, 138, 143, 159, 161, 170, 172, 174, 176, 183, 185, 187, 192, 197, 199, 202, 204, 206, 208, 211, 218, 220, 222, 224, 235

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 1216 terms from N. J. A. Sloane)
• Rémy Sigrist, Colored scatterplot of (x,y) such that A275609(x,y) = 2 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-A307192.