A113508 - cp's OEIS frontend

A113508 Pentagon-free numbers: numbers k such that no divisor of k is a pentagonal number > 1.

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	7
7	8
8	9
9	11
10	13
11	14
12	16
13	17
14	18
15	19
16	21
17	23
18	26
19	27
20	28
21	29
22	31
23	32
24	33
25	34
26	37
27	38
28	39
29	41
30	42
31	43
32	46
33	47
34	49
35	52
36	53
37	54
38	56
39	57
40	58
41	59
42	61
43	62
44	63
45	64
46	67
47	68
48	69
49	71
50	73
51	74
52	76
53	77
54	78
55	79
56	81
57	82
58	83
59	86
60	87
61	89
62	91
63	93
64	94
65	97
66	98
67	99
68	101

[1, 2, 3, 4, 6, 7, 8, 9, 11, 13, 14, 16, 17, 18, 19, 21, 23, 26, 27, 28, 29, 31, 32, 33, 34, 37, 38, 39, 41, 42, 43, 46, 47, 49, 52, 53, 54, 56, 57, 58, 59, 61, 62, 63, 64, 67, 68, 69, 71, 73, 74, 76, 77, 78, 79, 81, 82, 83, 86, 87, 89, 91, 93, 94, 97, 98, 99, 101]

cp's OEIS Frontend

A113508 Pentagon-free numbers: numbers k such that no divisor of k is a pentagonal number > 1.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	7
7	8
8	9
9	11
10	13
11	14
12	16
13	17
14	18
15	19
16	21
17	23
18	26
19	27
20	28
21	29
22	31
23	32
24	33
25	34
26	37
27	38
28	39
29	41
30	42
31	43
32	46
33	47
34	49
35	52
36	53
37	54
38	56
39	57
40	58
41	59
42	61
43	62
44	63
45	64
46	67
47	68
48	69
49	71
50	73
51	74
52	76
53	77
54	78
55	79
56	81
57	82
58	83
59	86
60	87
61	89
62	91
63	93
64	94
65	97
66	98
67	99
68	101

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	7
7	8
8	9
9	11
10	13
11	14
12	16
13	17
14	18
15	19
16	21
17	23
18	26
19	27
20	28
21	29
22	31
23	32
24	33
25	34
26	37
27	38
28	39
29	41
30	42
31	43
32	46
33	47
34	49
35	52
36	53
37	54
38	56
39	57
40	58
41	59
42	61
43	62
44	63
45	64
46	67
47	68
48	69
49	71
50	73
51	74
52	76
53	77
54	78
55	79
56	81
57	82
58	83
59	86
60	87
61	89
62	91
63	93
64	94
65	97
66	98
67	99
68	101

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	7
7	8
8	9
9	11
10	13
11	14
12	16
13	17
14	18
15	19
16	21
17	23
18	26
19	27
20	28
21	29
22	31
23	32
24	33
25	34
26	37
27	38
28	39
29	41
30	42
31	43
32	46
33	47
34	49
35	52
36	53
37	54
38	56
39	57
40	58
41	59
42	61
43	62
44	63
45	64
46	67
47	68
48	69
49	71
50	73
51	74
52	76
53	77
54	78
55	79
56	81
57	82
58	83
59	86
60	87
61	89
62	91
63	93
64	94
65	97
66	98
67	99
68	101