A345012 - cp's OEIS frontend

A345012 Lexicographically earliest sequence of nonnegative terms forming a clockwise square spiral when nothing else is read except the nonprime/prime nature of the digits (see the Comments section).

n	a(n)
1	0
2	2
3	3
4	1
5	5
6	4
7	7
8	6
9	8
10	20
11	9
12	21
13	10
14	24
15	11
16	26
17	14
18	12
19	16
20	18
21	28
22	19
23	40
24	29
25	41
26	44
27	30
28	46
29	48
30	13
31	49
32	60
33	61
34	31
35	64
36	66
37	68
38	34
39	69
40	80
41	81
42	36
43	84
44	86
45	88
46	15
47	89
48	90
49	91
50	94
51	38
52	96
53	98
54	99
55	102
56	100
57	101
58	104
59	39
60	106
61	108
62	109
63	50
64	110
65	111
66	114
67	51
68	116
69	118
70	119
71	17
72	140
73	141
74	144
75	103

[0, 2, 3, 1, 5, 4, 7, 6, 8, 20, 9, 21, 10, 24, 11, 26, 14, 12, 16, 18, 28, 19, 40, 29, 41, 44, 30, 46, 48, 13, 49, 60, 61, 31, 64, 66, 68, 34, 69, 80, 81, 36, 84, 86, 88, 15, 89, 90, 91, 94, 38, 96, 98, 99, 102, 100, 101, 104, 39, 106, 108, 109, 50, 110, 111, 114, 51, 116, 118, 119, 17, 140, 141, 144, 103]

cp's OEIS Frontend

A345012 Lexicographically earliest sequence of nonnegative terms forming a clockwise square spiral when nothing else is read except the nonprime/prime nature of the digits (see the Comments section).

Table of values

List of values

n	a(n)
1	0
2	2
3	3
4	1
5	5
6	4
7	7
8	6
9	8
10	20
11	9
12	21
13	10
14	24
15	11
16	26
17	14
18	12
19	16
20	18
21	28
22	19
23	40
24	29
25	41
26	44
27	30
28	46
29	48
30	13
31	49
32	60
33	61
34	31
35	64
36	66
37	68
38	34
39	69
40	80
41	81
42	36
43	84
44	86
45	88
46	15
47	89
48	90
49	91
50	94
51	38
52	96
53	98
54	99
55	102
56	100
57	101
58	104
59	39
60	106
61	108
62	109
63	50
64	110
65	111
66	114
67	51
68	116
69	118
70	119
71	17
72	140
73	141
74	144
75	103

n	a(n)
1	0
2	2
3	3
4	1
5	5
6	4
7	7
8	6
9	8
10	20
11	9
12	21
13	10
14	24
15	11
16	26
17	14
18	12
19	16
20	18
21	28
22	19
23	40
24	29
25	41
26	44
27	30
28	46
29	48
30	13
31	49
32	60
33	61
34	31
35	64
36	66
37	68
38	34
39	69
40	80
41	81
42	36
43	84
44	86
45	88
46	15
47	89
48	90
49	91
50	94
51	38
52	96
53	98
54	99
55	102
56	100
57	101
58	104
59	39
60	106
61	108
62	109
63	50
64	110
65	111
66	114
67	51
68	116
69	118
70	119
71	17
72	140
73	141
74	144
75	103

n	a(n)
1	0
2	2
3	3
4	1
5	5
6	4
7	7
8	6
9	8
10	20
11	9
12	21
13	10
14	24
15	11
16	26
17	14
18	12
19	16
20	18
21	28
22	19
23	40
24	29
25	41
26	44
27	30
28	46
29	48
30	13
31	49
32	60
33	61
34	31
35	64
36	66
37	68
38	34
39	69
40	80
41	81
42	36
43	84
44	86
45	88
46	15
47	89
48	90
49	91
50	94
51	38
52	96
53	98
54	99
55	102
56	100
57	101
58	104
59	39
60	106
61	108
62	109
63	50
64	110
65	111
66	114
67	51
68	116
69	118
70	119
71	17
72	140
73	141
74	144
75	103