A336547 - cp's OEIS frontend

A336547 Numbers k such that for 1 <= i < j <= h, all sigma(p_i^e_i), sigma(p_j^e_j) are pairwise coprime, when k = p_1^e_1 * ... * p_h^e_h, where each p_i^e_i is the maximal power of prime p_i dividing k.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	11
11	12
12	13
13	14
14	16
15	17
16	18
17	19
18	20
19	23
20	24
21	25
22	26
23	27
24	28
25	29
26	31
27	32
28	36
29	37
30	38
31	41
32	43
33	44
34	45
35	47
36	48
37	49
38	50
39	53
40	54
41	56
42	59
43	61
44	62
45	63
46	64
47	67
48	68
49	71
50	72
51	73
52	74
53	75
54	76
55	79
56	80
57	81
58	83
59	86
60	89
61	92
62	96
63	97
64	99
65	100
66	101
67	103
68	104
69	107
70	108
71	109
72	112
73	113
74	116
75	117
76	121
77	122
78	124
79	125

[1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 16, 17, 18, 19, 20, 23, 24, 25, 26, 27, 28, 29, 31, 32, 36, 37, 38, 41, 43, 44, 45, 47, 48, 49, 50, 53, 54, 56, 59, 61, 62, 63, 64, 67, 68, 71, 72, 73, 74, 75, 76, 79, 80, 81, 83, 86, 89, 92, 96, 97, 99, 100, 101, 103, 104, 107, 108, 109, 112, 113, 116, 117, 121, 122, 124, 125]

cp's OEIS Frontend

A336547 Numbers k such that for 1 <= i < j <= h, all sigma(p_i^e_i), sigma(p_j^e_j) are pairwise coprime, when k = p_1^e_1 * ... * p_h^e_h, where each p_i^e_i is the maximal power of prime p_i dividing k.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	11
11	12
12	13
13	14
14	16
15	17
16	18
17	19
18	20
19	23
20	24
21	25
22	26
23	27
24	28
25	29
26	31
27	32
28	36
29	37
30	38
31	41
32	43
33	44
34	45
35	47
36	48
37	49
38	50
39	53
40	54
41	56
42	59
43	61
44	62
45	63
46	64
47	67
48	68
49	71
50	72
51	73
52	74
53	75
54	76
55	79
56	80
57	81
58	83
59	86
60	89
61	92
62	96
63	97
64	99
65	100
66	101
67	103
68	104
69	107
70	108
71	109
72	112
73	113
74	116
75	117
76	121
77	122
78	124
79	125

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	11
11	12
12	13
13	14
14	16
15	17
16	18
17	19
18	20
19	23
20	24
21	25
22	26
23	27
24	28
25	29
26	31
27	32
28	36
29	37
30	38
31	41
32	43
33	44
34	45
35	47
36	48
37	49
38	50
39	53
40	54
41	56
42	59
43	61
44	62
45	63
46	64
47	67
48	68
49	71
50	72
51	73
52	74
53	75
54	76
55	79
56	80
57	81
58	83
59	86
60	89
61	92
62	96
63	97
64	99
65	100
66	101
67	103
68	104
69	107
70	108
71	109
72	112
73	113
74	116
75	117
76	121
77	122
78	124
79	125

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	11
11	12
12	13
13	14
14	16
15	17
16	18
17	19
18	20
19	23
20	24
21	25
22	26
23	27
24	28
25	29
26	31
27	32
28	36
29	37
30	38
31	41
32	43
33	44
34	45
35	47
36	48
37	49
38	50
39	53
40	54
41	56
42	59
43	61
44	62
45	63
46	64
47	67
48	68
49	71
50	72
51	73
52	74
53	75
54	76
55	79
56	80
57	81
58	83
59	86
60	89
61	92
62	96
63	97
64	99
65	100
66	101
67	103
68	104
69	107
70	108
71	109
72	112
73	113
74	116
75	117
76	121
77	122
78	124
79	125