A215726 - cp's OEIS frontend

A215726 Numbers k such that the k-th triangular number is squarefree.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	10
8	11
9	12
10	13
11	14
12	19
13	20
14	21
15	22
16	28
17	29
18	30
19	33
20	34
21	37
22	38
23	41
24	42
25	43
26	46
27	51
28	52
29	57
30	58
31	59
32	60
33	61
34	65
35	66
36	67
37	68
38	69
39	70
40	73
41	76
42	77
43	78
44	82
45	83
46	84
47	85
48	86
49	91
50	92
51	93
52	94
53	101
54	102
55	105
56	106
57	109
58	110
59	113
60	114
61	115
62	118
63	122
64	123

[1, 2, 3, 4, 5, 6, 10, 11, 12, 13, 14, 19, 20, 21, 22, 28, 29, 30, 33, 34, 37, 38, 41, 42, 43, 46, 51, 52, 57, 58, 59, 60, 61, 65, 66, 67, 68, 69, 70, 73, 76, 77, 78, 82, 83, 84, 85, 86, 91, 92, 93, 94, 101, 102, 105, 106, 109, 110, 113, 114, 115, 118, 122, 123]

cp's OEIS Frontend

A215726 Numbers k such that the k-th triangular number is squarefree.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	10
8	11
9	12
10	13
11	14
12	19
13	20
14	21
15	22
16	28
17	29
18	30
19	33
20	34
21	37
22	38
23	41
24	42
25	43
26	46
27	51
28	52
29	57
30	58
31	59
32	60
33	61
34	65
35	66
36	67
37	68
38	69
39	70
40	73
41	76
42	77
43	78
44	82
45	83
46	84
47	85
48	86
49	91
50	92
51	93
52	94
53	101
54	102
55	105
56	106
57	109
58	110
59	113
60	114
61	115
62	118
63	122
64	123

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	10
8	11
9	12
10	13
11	14
12	19
13	20
14	21
15	22
16	28
17	29
18	30
19	33
20	34
21	37
22	38
23	41
24	42
25	43
26	46
27	51
28	52
29	57
30	58
31	59
32	60
33	61
34	65
35	66
36	67
37	68
38	69
39	70
40	73
41	76
42	77
43	78
44	82
45	83
46	84
47	85
48	86
49	91
50	92
51	93
52	94
53	101
54	102
55	105
56	106
57	109
58	110
59	113
60	114
61	115
62	118
63	122
64	123

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	10
8	11
9	12
10	13
11	14
12	19
13	20
14	21
15	22
16	28
17	29
18	30
19	33
20	34
21	37
22	38
23	41
24	42
25	43
26	46
27	51
28	52
29	57
30	58
31	59
32	60
33	61
34	65
35	66
36	67
37	68
38	69
39	70
40	73
41	76
42	77
43	78
44	82
45	83
46	84
47	85
48	86
49	91
50	92
51	93
52	94
53	101
54	102
55	105
56	106
57	109
58	110
59	113
60	114
61	115
62	118
63	122
64	123