A360663 - cp's OEIS frontend

A360663 a(n) is the least integer m >= 3 such that n is a centered m-gonal number.

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

[3, 4, 5, 6, 7, 8, 3, 10, 11, 4, 13, 14, 5, 16, 17, 3, 19, 20, 7, 22, 23, 4, 25, 26, 9, 28, 29, 3, 31, 32, 11, 34, 35, 6, 37, 38, 13, 4, 41, 7, 43, 44, 3, 46, 47, 8, 49, 5, 17, 52, 53, 9, 55, 56, 19, 58, 59, 4, 61, 62, 3, 64, 65, 11, 67, 68, 23, 7, 71, 12, 73, 74, 5, 76, 77, 13, 79]

cp's OEIS Frontend

A360663 a(n) is the least integer m >= 3 such that n is a centered m-gonal number.

Table of values

List of values

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

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

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