A338745 - cp's OEIS frontend

A338745 When a(n) is even, a(n) is the number of prime digits present so far in the sequence, a(n) included.

n	a(n)
1	1
2	3
3	2
4	5
5	7
6	4
7	9
8	11
9	13
10	15
11	6
12	17
13	19
14	21
15	8
16	23
17	10
18	25
19	27
20	14
21	29
22	31
23	16
24	33
25	18
26	35
27	22
28	37
29	39
30	26
31	41
32	43
33	28
34	45
35	30
36	32
37	47
38	34
39	49
40	51
41	36
42	53
43	55
44	40
45	57
46	59
47	61
48	63
49	44
50	65
51	67
52	46
53	69
54	71
55	73
56	50
57	52
58	75
59	77
60	79
61	58
62	81
63	83
64	85
65	60
66	87
67	62
68	89
69	91
70	93
71	95
72	64
73	97
74	99
75	101
76	103
77	66

[1, 3, 2, 5, 7, 4, 9, 11, 13, 15, 6, 17, 19, 21, 8, 23, 10, 25, 27, 14, 29, 31, 16, 33, 18, 35, 22, 37, 39, 26, 41, 43, 28, 45, 30, 32, 47, 34, 49, 51, 36, 53, 55, 40, 57, 59, 61, 63, 44, 65, 67, 46, 69, 71, 73, 50, 52, 75, 77, 79, 58, 81, 83, 85, 60, 87, 62, 89, 91, 93, 95, 64, 97, 99, 101, 103, 66]

cp's OEIS Frontend

A338745 When a(n) is even, a(n) is the number of prime digits present so far in the sequence, a(n) included.

Table of values

List of values

n	a(n)
1	1
2	3
3	2
4	5
5	7
6	4
7	9
8	11
9	13
10	15
11	6
12	17
13	19
14	21
15	8
16	23
17	10
18	25
19	27
20	14
21	29
22	31
23	16
24	33
25	18
26	35
27	22
28	37
29	39
30	26
31	41
32	43
33	28
34	45
35	30
36	32
37	47
38	34
39	49
40	51
41	36
42	53
43	55
44	40
45	57
46	59
47	61
48	63
49	44
50	65
51	67
52	46
53	69
54	71
55	73
56	50
57	52
58	75
59	77
60	79
61	58
62	81
63	83
64	85
65	60
66	87
67	62
68	89
69	91
70	93
71	95
72	64
73	97
74	99
75	101
76	103
77	66

n	a(n)
1	1
2	3
3	2
4	5
5	7
6	4
7	9
8	11
9	13
10	15
11	6
12	17
13	19
14	21
15	8
16	23
17	10
18	25
19	27
20	14
21	29
22	31
23	16
24	33
25	18
26	35
27	22
28	37
29	39
30	26
31	41
32	43
33	28
34	45
35	30
36	32
37	47
38	34
39	49
40	51
41	36
42	53
43	55
44	40
45	57
46	59
47	61
48	63
49	44
50	65
51	67
52	46
53	69
54	71
55	73
56	50
57	52
58	75
59	77
60	79
61	58
62	81
63	83
64	85
65	60
66	87
67	62
68	89
69	91
70	93
71	95
72	64
73	97
74	99
75	101
76	103
77	66

n	a(n)
1	1
2	3
3	2
4	5
5	7
6	4
7	9
8	11
9	13
10	15
11	6
12	17
13	19
14	21
15	8
16	23
17	10
18	25
19	27
20	14
21	29
22	31
23	16
24	33
25	18
26	35
27	22
28	37
29	39
30	26
31	41
32	43
33	28
34	45
35	30
36	32
37	47
38	34
39	49
40	51
41	36
42	53
43	55
44	40
45	57
46	59
47	61
48	63
49	44
50	65
51	67
52	46
53	69
54	71
55	73
56	50
57	52
58	75
59	77
60	79
61	58
62	81
63	83
64	85
65	60
66	87
67	62
68	89
69	91
70	93
71	95
72	64
73	97
74	99
75	101
76	103
77	66