A333914 - cp's OEIS frontend

A333914 a(n) is the least integer m >= 3 such that n is m-gonal pyramidal number.

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

[3, 4, 5, 6, 7, 8, 3, 10, 11, 12, 4, 14, 15, 16, 5, 18, 3, 20, 6, 22, 23, 24, 7, 26, 27, 28, 4, 30, 31, 32, 9, 3, 35, 36, 10, 38, 5, 40, 11, 42, 43, 44, 12, 46, 47, 48, 6, 50, 51, 52, 14, 4, 3, 56, 15, 58, 7, 60, 16, 62, 63, 64, 17, 66, 67, 68, 8, 70, 71, 72, 19, 5, 75, 76, 20, 78, 9]

cp's OEIS Frontend

A333914 a(n) is the least integer m >= 3 such that n is m-gonal pyramidal 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	12
14	4
15	14
16	15
17	16
18	5
19	18
20	3
21	20
22	6
23	22
24	23
25	24
26	7
27	26
28	27
29	28
30	4
31	30
32	31
33	32
34	9
35	3
36	35
37	36
38	10
39	38
40	5
41	40
42	11
43	42
44	43
45	44
46	12
47	46
48	47
49	48
50	6
51	50
52	51
53	52
54	14
55	4
56	3
57	56
58	15
59	58
60	7
61	60
62	16
63	62
64	63
65	64
66	17
67	66
68	67
69	68
70	8
71	70
72	71
73	72
74	19
75	5
76	75
77	76
78	20
79	78
80	9

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

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