A177028 - cp's OEIS frontend

A177028 Irregular table: row n contains values k (in descending order) for which n is a k-gonal number.

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

[3, 4, 5, 6, 3, 7, 8, 9, 4, 10, 3, 11, 12, 5, 13, 14, 15, 6, 3, 16, 4, 17, 18, 7, 19, 20, 21, 8, 3, 22, 5, 23, 24, 9, 25, 4, 26, 27, 10, 28, 6, 3, 29, 30, 11, 31, 32, 33, 12, 34, 7, 35, 5, 36, 13, 4, 3, 37, 38, 39, 14, 40, 8, 41, 42, 15]

cp's OEIS Frontend

A177028 Irregular table: row n contains values k (in descending order) for which n is a k-gonal number.

Table of values

List of values

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

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

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