A309945 - cp's OEIS frontend

A309945 a(n) = floor(n - sqrt(2*n-1)).

n	a(n)
1	0
2	0
3	0
4	1
5	2
6	2
7	3
8	4
9	4
10	5
11	6
12	7
13	8
14	8
15	9
16	10
17	11
18	12
19	12
20	13
21	14
22	15
23	16
24	17
25	18
26	18
27	19
28	20
29	21
30	22
31	23
32	24
33	24
34	25
35	26
36	27
37	28
38	29
39	30
40	31
41	32
42	32
43	33
44	34
45	35
46	36
47	37
48	38
49	39
50	40
51	40
52	41
53	42
54	43
55	44
56	45
57	46
58	47
59	48
60	49
61	50
62	50
63	51
64	52
65	53
66	54
67	55
68	56
69	57
70	58
71	59
72	60
73	60

[0, 0, 0, 1, 2, 2, 3, 4, 4, 5, 6, 7, 8, 8, 9, 10, 11, 12, 12, 13, 14, 15, 16, 17, 18, 18, 19, 20, 21, 22, 23, 24, 24, 25, 26, 27, 28, 29, 30, 31, 32, 32, 33, 34, 35, 36, 37, 38, 39, 40, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 60]

cp's OEIS Frontend

A309945 a(n) = floor(n - sqrt(2*n-1)).

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	1
5	2
6	2
7	3
8	4
9	4
10	5
11	6
12	7
13	8
14	8
15	9
16	10
17	11
18	12
19	12
20	13
21	14
22	15
23	16
24	17
25	18
26	18
27	19
28	20
29	21
30	22
31	23
32	24
33	24
34	25
35	26
36	27
37	28
38	29
39	30
40	31
41	32
42	32
43	33
44	34
45	35
46	36
47	37
48	38
49	39
50	40
51	40
52	41
53	42
54	43
55	44
56	45
57	46
58	47
59	48
60	49
61	50
62	50
63	51
64	52
65	53
66	54
67	55
68	56
69	57
70	58
71	59
72	60
73	60

n	a(n)
1	0
2	0
3	0
4	1
5	2
6	2
7	3
8	4
9	4
10	5
11	6
12	7
13	8
14	8
15	9
16	10
17	11
18	12
19	12
20	13
21	14
22	15
23	16
24	17
25	18
26	18
27	19
28	20
29	21
30	22
31	23
32	24
33	24
34	25
35	26
36	27
37	28
38	29
39	30
40	31
41	32
42	32
43	33
44	34
45	35
46	36
47	37
48	38
49	39
50	40
51	40
52	41
53	42
54	43
55	44
56	45
57	46
58	47
59	48
60	49
61	50
62	50
63	51
64	52
65	53
66	54
67	55
68	56
69	57
70	58
71	59
72	60
73	60

n	a(n)
1	0
2	0
3	0
4	1
5	2
6	2
7	3
8	4
9	4
10	5
11	6
12	7
13	8
14	8
15	9
16	10
17	11
18	12
19	12
20	13
21	14
22	15
23	16
24	17
25	18
26	18
27	19
28	20
29	21
30	22
31	23
32	24
33	24
34	25
35	26
36	27
37	28
38	29
39	30
40	31
41	32
42	32
43	33
44	34
45	35
46	36
47	37
48	38
49	39
50	40
51	40
52	41
53	42
54	43
55	44
56	45
57	46
58	47
59	48
60	49
61	50
62	50
63	51
64	52
65	53
66	54
67	55
68	56
69	57
70	58
71	59
72	60
73	60