A335364 - cp's OEIS frontend

A335364 The squares visited on the Ulam spiral when starting at square 1 and then stepping to the closest visible unvisited square which contains a prime number. If two or more visible squares are the same distance from the current square then the one with the smallest prime number is chosen.

n	a(n)
1	1
2	2
3	3
4	11
5	29
6	13
7	31
8	59
9	89
10	131
11	179
12	127
13	83
14	53
15	5
16	17
17	37
18	67
19	103
20	149
21	101
22	61
23	97
24	139
25	191
26	251
27	193
28	137
29	313
30	389
31	311
32	241
33	307
34	379
35	461
36	383
37	467
38	557
39	463
40	761
41	653
42	757
43	647
44	751
45	863
46	983
47	643
48	547
49	457
50	239
51	181
52	233
53	173
54	229
55	293
56	227
57	223
58	167
59	521
60	433
61	353
62	281

[1, 2, 3, 11, 29, 13, 31, 59, 89, 131, 179, 127, 83, 53, 5, 17, 37, 67, 103, 149, 101, 61, 97, 139, 191, 251, 193, 137, 313, 389, 311, 241, 307, 379, 461, 383, 467, 557, 463, 761, 653, 757, 647, 751, 863, 983, 643, 547, 457, 239, 181, 233, 173, 229, 293, 227, 223, 167, 521, 433, 353, 281]

cp's OEIS Frontend

A335364 The squares visited on the Ulam spiral when starting at square 1 and then stepping to the closest visible unvisited square which contains a prime number. If two or more visible squares are the same distance from the current square then the one with the smallest prime number is chosen.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	11
5	29
6	13
7	31
8	59
9	89
10	131
11	179
12	127
13	83
14	53
15	5
16	17
17	37
18	67
19	103
20	149
21	101
22	61
23	97
24	139
25	191
26	251
27	193
28	137
29	313
30	389
31	311
32	241
33	307
34	379
35	461
36	383
37	467
38	557
39	463
40	761
41	653
42	757
43	647
44	751
45	863
46	983
47	643
48	547
49	457
50	239
51	181
52	233
53	173
54	229
55	293
56	227
57	223
58	167
59	521
60	433
61	353
62	281

n	a(n)
1	1
2	2
3	3
4	11
5	29
6	13
7	31
8	59
9	89
10	131
11	179
12	127
13	83
14	53
15	5
16	17
17	37
18	67
19	103
20	149
21	101
22	61
23	97
24	139
25	191
26	251
27	193
28	137
29	313
30	389
31	311
32	241
33	307
34	379
35	461
36	383
37	467
38	557
39	463
40	761
41	653
42	757
43	647
44	751
45	863
46	983
47	643
48	547
49	457
50	239
51	181
52	233
53	173
54	229
55	293
56	227
57	223
58	167
59	521
60	433
61	353
62	281

n	a(n)
1	1
2	2
3	3
4	11
5	29
6	13
7	31
8	59
9	89
10	131
11	179
12	127
13	83
14	53
15	5
16	17
17	37
18	67
19	103
20	149
21	101
22	61
23	97
24	139
25	191
26	251
27	193
28	137
29	313
30	389
31	311
32	241
33	307
34	379
35	461
36	383
37	467
38	557
39	463
40	761
41	653
42	757
43	647
44	751
45	863
46	983
47	643
48	547
49	457
50	239
51	181
52	233
53	173
54	229
55	293
56	227
57	223
58	167
59	521
60	433
61	353
62	281