A345437 - cp's OEIS frontend

A345437 Represent the ring R = {x+y*sqrt(-2): x, y rational integers} by the cells centered at the points (x,y) of a square grid; number the cells of the grid along a counterclockwise square spiral, with the cells at (0,0) and (1,0) numbered 0, 1. Sequence lists the index numbers of the cells which are 0 or a prime in R.

n	a(n)
1	0
2	2
3	3
4	4
5	6
6	7
7	8
8	25
9	26
10	28
11	29
12	32
13	34
14	37
15	38
16	40
17	41
18	44
19	46
20	57
21	63
22	73
23	79

[0, 2, 3, 4, 6, 7, 8, 25, 26, 28, 29, 32, 34, 37, 38, 40, 41, 44, 46, 57, 63, 73, 79]