A332583 - cp's OEIS frontend

A332583 Label only the prime-numbered position cells of the infinite 2D square lattice with the square spiral (or Ulam spiral), starting with 1 at the center; sequence lists primes that are visible from square 1.

n	a(n)
1	2
2	3
3	5
4	7
5	19
6	23
7	29
8	41
9	47
10	59
11	61
12	67
13	71
14	79
15	83
16	89
17	97
18	103
19	107
20	109
21	113
22	131
23	137
24	149
25	167
26	173
27	179
28	181
29	191
30	193
31	199
32	223
33	227
34	229
35	239
36	251
37	263
38	271
39	277
40	283
41	293
42	311
43	317
44	347
45	349
46	353
47	359
48	367
49	373
50	379
51	383
52	389
53	397
54	409
55	419
56	433
57	439
58	443
59	449
60	457
61	461
62	467
63	479
64	487
65	491
66	499
67	503

[2, 3, 5, 7, 19, 23, 29, 41, 47, 59, 61, 67, 71, 79, 83, 89, 97, 103, 107, 109, 113, 131, 137, 149, 167, 173, 179, 181, 191, 193, 199, 223, 227, 229, 239, 251, 263, 271, 277, 283, 293, 311, 317, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 409, 419, 433, 439, 443, 449, 457, 461, 467, 479, 487, 491, 499, 503]

cp's OEIS Frontend

A332583 Label only the prime-numbered position cells of the infinite 2D square lattice with the square spiral (or Ulam spiral), starting with 1 at the center; sequence lists primes that are visible from square 1.

Table of values

List of values

n	a(n)
1	2
2	3
3	5
4	7
5	19
6	23
7	29
8	41
9	47
10	59
11	61
12	67
13	71
14	79
15	83
16	89
17	97
18	103
19	107
20	109
21	113
22	131
23	137
24	149
25	167
26	173
27	179
28	181
29	191
30	193
31	199
32	223
33	227
34	229
35	239
36	251
37	263
38	271
39	277
40	283
41	293
42	311
43	317
44	347
45	349
46	353
47	359
48	367
49	373
50	379
51	383
52	389
53	397
54	409
55	419
56	433
57	439
58	443
59	449
60	457
61	461
62	467
63	479
64	487
65	491
66	499
67	503

n	a(n)
1	2
2	3
3	5
4	7
5	19
6	23
7	29
8	41
9	47
10	59
11	61
12	67
13	71
14	79
15	83
16	89
17	97
18	103
19	107
20	109
21	113
22	131
23	137
24	149
25	167
26	173
27	179
28	181
29	191
30	193
31	199
32	223
33	227
34	229
35	239
36	251
37	263
38	271
39	277
40	283
41	293
42	311
43	317
44	347
45	349
46	353
47	359
48	367
49	373
50	379
51	383
52	389
53	397
54	409
55	419
56	433
57	439
58	443
59	449
60	457
61	461
62	467
63	479
64	487
65	491
66	499
67	503

n	a(n)
1	2
2	3
3	5
4	7
5	19
6	23
7	29
8	41
9	47
10	59
11	61
12	67
13	71
14	79
15	83
16	89
17	97
18	103
19	107
20	109
21	113
22	131
23	137
24	149
25	167
26	173
27	179
28	181
29	191
30	193
31	199
32	223
33	227
34	229
35	239
36	251
37	263
38	271
39	277
40	283
41	293
42	311
43	317
44	347
45	349
46	353
47	359
48	367
49	373
50	379
51	383
52	389
53	397
54	409
55	419
56	433
57	439
58	443
59	449
60	457
61	461
62	467
63	479
64	487
65	491
66	499
67	503