A309407 - cp's OEIS frontend

A309407 a(n) = round(sqrt(3*n + 9/4)), with a(0) = 1.

n	a(n)
0	1
1	2
2	3
3	3
4	4
5	4
6	4
7	5
8	5
9	5
10	6
11	6
12	6
13	6
14	7
15	7
16	7
17	7
18	8
19	8
20	8
21	8
22	8
23	8
24	9
25	9
26	9
27	9
28	9
29	9
30	10
31	10
32	10
33	10
34	10
35	10
36	10
37	11
38	11
39	11
40	11
41	11
42	11
43	11
44	12
45	12
46	12
47	12
48	12
49	12
50	12
51	12
52	13
53	13
54	13
55	13
56	13
57	13
58	13
59	13
60	14
61	14
62	14
63	14
64	14
65	14
66	14
67	14
68	14
69	14
70	15
71	15
72	15
73	15
74	15
75	15
76	15
77	15
78	15
79	15
80	16
81	16
82	16
83	16
84	16
85	16
86	16
87	16
88	16

[1, 2, 3, 3, 4, 4, 4, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16, 16]

cp's OEIS Frontend

A309407 a(n) = round(sqrt(3*n + 9/4)), with a(0) = 1.

Table of values

List of values

n	a(n)
0	1
1	2
2	3
3	3
4	4
5	4
6	4
7	5
8	5
9	5
10	6
11	6
12	6
13	6
14	7
15	7
16	7
17	7
18	8
19	8
20	8
21	8
22	8
23	8
24	9
25	9
26	9
27	9
28	9
29	9
30	10
31	10
32	10
33	10
34	10
35	10
36	10
37	11
38	11
39	11
40	11
41	11
42	11
43	11
44	12
45	12
46	12
47	12
48	12
49	12
50	12
51	12
52	13
53	13
54	13
55	13
56	13
57	13
58	13
59	13
60	14
61	14
62	14
63	14
64	14
65	14
66	14
67	14
68	14
69	14
70	15
71	15
72	15
73	15
74	15
75	15
76	15
77	15
78	15
79	15
80	16
81	16
82	16
83	16
84	16
85	16
86	16
87	16
88	16

n	a(n)
0	1
1	2
2	3
3	3
4	4
5	4
6	4
7	5
8	5
9	5
10	6
11	6
12	6
13	6
14	7
15	7
16	7
17	7
18	8
19	8
20	8
21	8
22	8
23	8
24	9
25	9
26	9
27	9
28	9
29	9
30	10
31	10
32	10
33	10
34	10
35	10
36	10
37	11
38	11
39	11
40	11
41	11
42	11
43	11
44	12
45	12
46	12
47	12
48	12
49	12
50	12
51	12
52	13
53	13
54	13
55	13
56	13
57	13
58	13
59	13
60	14
61	14
62	14
63	14
64	14
65	14
66	14
67	14
68	14
69	14
70	15
71	15
72	15
73	15
74	15
75	15
76	15
77	15
78	15
79	15
80	16
81	16
82	16
83	16
84	16
85	16
86	16
87	16
88	16

n	a(n)
0	1
1	2
2	3
3	3
4	4
5	4
6	4
7	5
8	5
9	5
10	6
11	6
12	6
13	6
14	7
15	7
16	7
17	7
18	8
19	8
20	8
21	8
22	8
23	8
24	9
25	9
26	9
27	9
28	9
29	9
30	10
31	10
32	10
33	10
34	10
35	10
36	10
37	11
38	11
39	11
40	11
41	11
42	11
43	11
44	12
45	12
46	12
47	12
48	12
49	12
50	12
51	12
52	13
53	13
54	13
55	13
56	13
57	13
58	13
59	13
60	14
61	14
62	14
63	14
64	14
65	14
66	14
67	14
68	14
69	14
70	15
71	15
72	15
73	15
74	15
75	15
76	15
77	15
78	15
79	15
80	16
81	16
82	16
83	16
84	16
85	16
86	16
87	16
88	16