A307192 Positions of 4's in the square spiral in A275609.

13, 37, 62, 102, 140, 157, 200, 217, 250, 290, 330, 359, 392, 443, 452, 492, 525, 566, 629, 651, 686, 723, 768, 772, 847, 889, 912, 953, 1009, 1097, 1157, 1170, 1215, 1279, 1379, 1459, 1468, 1509, 1581, 1693, 1781, 1807, 1835, 1915, 1996, 2039, 2135

Offset

1,1

Links

Alois P. Heinz, Table of n, a(n) for n = 1..2886

Rémy Sigrist, Colored scatterplot of (x,y) such that A275609(x,y) = 4 and -500 <= x <= 500 and -500 <= y <= 500 (where the color is function of (x mod 2) + 2 * (y mod 2))

N. J. A. Sloane, Central portion of spiral in A275609 showing just the 4's [Entries 0,1,2,3 in the spiral have been replaced by dots. The central 0 has been changed to an X. The illustration shows cells (x,y) with -35 <= x <= 35, -33 <= y <= 36.]

Crossrefs

Cf. A275609, A307188-A307191.

Sequence in context: A139530 A138368 A118071 * A147207 A146877 A309720

Adjacent sequences: A307189 A307190 A307191 * A307193 A307194 A307195

Keyword

nonn

Author

N. J. A. Sloane, Mar 28 2019

Status

approved