A255165 - cp's OEIS frontend

A255165 a(n) = Sum_{k=2..n} floor(log(n)/log(k)), n >= 1.

n	a(n)
1	0
2	1
3	2
4	4
5	5
6	6
7	7
8	9
9	11
10	12
11	13
12	14
13	15
14	16
15	17
16	20
17	21
18	22
19	23
20	24
21	25
22	26
23	27
24	28
25	30
26	31
27	33
28	34
29	35
30	36
31	37
32	39
33	40
34	41
35	42
36	44
37	45
38	46
39	47
40	48
41	49
42	50
43	51
44	52
45	53
46	54
47	55
48	56
49	58
50	59
51	60
52	61
53	62
54	63
55	64
56	65
57	66
58	67
59	68
60	69
61	70
62	71
63	72

[0, 1, 2, 4, 5, 6, 7, 9, 11, 12, 13, 14, 15, 16, 17, 20, 21, 22, 23, 24, 25, 26, 27, 28, 30, 31, 33, 34, 35, 36, 37, 39, 40, 41, 42, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72]

cp's OEIS Frontend

A255165 a(n) = Sum_{k=2..n} floor(log(n)/log(k)), n >= 1.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	4
5	5
6	6
7	7
8	9
9	11
10	12
11	13
12	14
13	15
14	16
15	17
16	20
17	21
18	22
19	23
20	24
21	25
22	26
23	27
24	28
25	30
26	31
27	33
28	34
29	35
30	36
31	37
32	39
33	40
34	41
35	42
36	44
37	45
38	46
39	47
40	48
41	49
42	50
43	51
44	52
45	53
46	54
47	55
48	56
49	58
50	59
51	60
52	61
53	62
54	63
55	64
56	65
57	66
58	67
59	68
60	69
61	70
62	71
63	72

n	a(n)
1	0
2	1
3	2
4	4
5	5
6	6
7	7
8	9
9	11
10	12
11	13
12	14
13	15
14	16
15	17
16	20
17	21
18	22
19	23
20	24
21	25
22	26
23	27
24	28
25	30
26	31
27	33
28	34
29	35
30	36
31	37
32	39
33	40
34	41
35	42
36	44
37	45
38	46
39	47
40	48
41	49
42	50
43	51
44	52
45	53
46	54
47	55
48	56
49	58
50	59
51	60
52	61
53	62
54	63
55	64
56	65
57	66
58	67
59	68
60	69
61	70
62	71
63	72

n	a(n)
1	0
2	1
3	2
4	4
5	5
6	6
7	7
8	9
9	11
10	12
11	13
12	14
13	15
14	16
15	17
16	20
17	21
18	22
19	23
20	24
21	25
22	26
23	27
24	28
25	30
26	31
27	33
28	34
29	35
30	36
31	37
32	39
33	40
34	41
35	42
36	44
37	45
38	46
39	47
40	48
41	49
42	50
43	51
44	52
45	53
46	54
47	55
48	56
49	58
50	59
51	60
52	61
53	62
54	63
55	64
56	65
57	66
58	67
59	68
60	69
61	70
62	71
63	72