A338743 - cp's OEIS frontend

A338743 When a(n) is odd, a(n) is the number of even digits present so far in the sequence, a(n) included.

n	a(n)
1	0
2	1
3	2
4	4
5	3
6	6
7	8
8	5
9	10
10	12
11	7
12	14
13	16
14	9
15	18
16	20
17	22
18	24
19	26
20	28
21	21
22	30
23	23
24	32
25	25
26	34
27	27
28	36
29	29
30	38
31	40
32	42
33	44
34	46
35	48
36	41
37	50
38	43
39	52
40	45
41	54
42	47
43	56
44	49
45	58
46	60
47	62
48	64
49	66
50	68
51	61
52	70
53	63
54	72
55	65
56	74
57	67
58	76
59	69
60	78
61	80
62	82
63	84
64	86
65	88
66	81
67	90
68	83
69	92
70	85
71	94
72	87
73	96
74	89
75	98
76	100
77	102
78	104

[0, 1, 2, 4, 3, 6, 8, 5, 10, 12, 7, 14, 16, 9, 18, 20, 22, 24, 26, 28, 21, 30, 23, 32, 25, 34, 27, 36, 29, 38, 40, 42, 44, 46, 48, 41, 50, 43, 52, 45, 54, 47, 56, 49, 58, 60, 62, 64, 66, 68, 61, 70, 63, 72, 65, 74, 67, 76, 69, 78, 80, 82, 84, 86, 88, 81, 90, 83, 92, 85, 94, 87, 96, 89, 98, 100, 102, 104]

cp's OEIS Frontend

A338743 When a(n) is odd, a(n) is the number of even digits present so far in the sequence, a(n) included.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	4
5	3
6	6
7	8
8	5
9	10
10	12
11	7
12	14
13	16
14	9
15	18
16	20
17	22
18	24
19	26
20	28
21	21
22	30
23	23
24	32
25	25
26	34
27	27
28	36
29	29
30	38
31	40
32	42
33	44
34	46
35	48
36	41
37	50
38	43
39	52
40	45
41	54
42	47
43	56
44	49
45	58
46	60
47	62
48	64
49	66
50	68
51	61
52	70
53	63
54	72
55	65
56	74
57	67
58	76
59	69
60	78
61	80
62	82
63	84
64	86
65	88
66	81
67	90
68	83
69	92
70	85
71	94
72	87
73	96
74	89
75	98
76	100
77	102
78	104

n	a(n)
1	0
2	1
3	2
4	4
5	3
6	6
7	8
8	5
9	10
10	12
11	7
12	14
13	16
14	9
15	18
16	20
17	22
18	24
19	26
20	28
21	21
22	30
23	23
24	32
25	25
26	34
27	27
28	36
29	29
30	38
31	40
32	42
33	44
34	46
35	48
36	41
37	50
38	43
39	52
40	45
41	54
42	47
43	56
44	49
45	58
46	60
47	62
48	64
49	66
50	68
51	61
52	70
53	63
54	72
55	65
56	74
57	67
58	76
59	69
60	78
61	80
62	82
63	84
64	86
65	88
66	81
67	90
68	83
69	92
70	85
71	94
72	87
73	96
74	89
75	98
76	100
77	102
78	104

n	a(n)
1	0
2	1
3	2
4	4
5	3
6	6
7	8
8	5
9	10
10	12
11	7
12	14
13	16
14	9
15	18
16	20
17	22
18	24
19	26
20	28
21	21
22	30
23	23
24	32
25	25
26	34
27	27
28	36
29	29
30	38
31	40
32	42
33	44
34	46
35	48
36	41
37	50
38	43
39	52
40	45
41	54
42	47
43	56
44	49
45	58
46	60
47	62
48	64
49	66
50	68
51	61
52	70
53	63
54	72
55	65
56	74
57	67
58	76
59	69
60	78
61	80
62	82
63	84
64	86
65	88
66	81
67	90
68	83
69	92
70	85
71	94
72	87
73	96
74	89
75	98
76	100
77	102
78	104