A338221 - cp's OEIS frontend

A338221 Square spiral of distinct positive integers built by greedy algorithm such that each new value (except the initial one) is a divisor or a multiple of some earlier horizontally or vertically adjacent value.

n	a(n)
0	1
1	2
2	4
3	3
4	6
5	5
6	10
7	7
8	8
9	16
10	12
11	20
12	40
13	24
14	9
15	18
16	36
17	30
18	15
19	45
20	90
21	50
22	14
23	28
24	32
25	64
26	48
27	60
28	80
29	120
30	240
31	160
32	72
33	27
34	54
35	108
36	216
37	144
38	150
39	25
40	75
41	180
42	360
43	270
44	100
45	42
46	21
47	63
48	126
49	252
50	84
51	96
52	192
53	320
54	480
55	720
56	1440
57	288
58	576
59	432
60	81
61	162

[1, 2, 4, 3, 6, 5, 10, 7, 8, 16, 12, 20, 40, 24, 9, 18, 36, 30, 15, 45, 90, 50, 14, 28, 32, 64, 48, 60, 80, 120, 240, 160, 72, 27, 54, 108, 216, 144, 150, 25, 75, 180, 360, 270, 100, 42, 21, 63, 126, 252, 84, 96, 192, 320, 480, 720, 1440, 288, 576, 432, 81, 162]

cp's OEIS Frontend

A338221 Square spiral of distinct positive integers built by greedy algorithm such that each new value (except the initial one) is a divisor or a multiple of some earlier horizontally or vertically adjacent value.

Table of values

List of values