A336548 - cp's OEIS frontend

A336548 Numbers k such that at least one pair sigma(p_i^e_i), sigma(p_j^e_j) [with i != j] share a prime factor, 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	10
2	15
3	21
4	22
5	30
6	33
7	34
8	35
9	39
10	40
11	42
12	46
13	51
14	52
15	55
16	57
17	58
18	60
19	65
20	66
21	69
22	70
23	77
24	78
25	82
26	84
27	85
28	87
29	88
30	90
31	91
32	93
33	94
34	95
35	98
36	102
37	105
38	106
39	110
40	111
41	114
42	115
43	118
44	119
45	120
46	123
47	129
48	130
49	132
50	133
51	135
52	136
53	138
54	140
55	141
56	142
57	143
58	145
59	152
60	154
61	155
62	156
63	159
64	160
65	161
66	164
67	165
68	166
69	168
70	170

[10, 15, 21, 22, 30, 33, 34, 35, 39, 40, 42, 46, 51, 52, 55, 57, 58, 60, 65, 66, 69, 70, 77, 78, 82, 84, 85, 87, 88, 90, 91, 93, 94, 95, 98, 102, 105, 106, 110, 111, 114, 115, 118, 119, 120, 123, 129, 130, 132, 133, 135, 136, 138, 140, 141, 142, 143, 145, 152, 154, 155, 156, 159, 160, 161, 164, 165, 166, 168, 170]

cp's OEIS Frontend

A336548 Numbers k such that at least one pair sigma(p_i^e_i), sigma(p_j^e_j) [with i != j] share a prime factor, 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	10
2	15
3	21
4	22
5	30
6	33
7	34
8	35
9	39
10	40
11	42
12	46
13	51
14	52
15	55
16	57
17	58
18	60
19	65
20	66
21	69
22	70
23	77
24	78
25	82
26	84
27	85
28	87
29	88
30	90
31	91
32	93
33	94
34	95
35	98
36	102
37	105
38	106
39	110
40	111
41	114
42	115
43	118
44	119
45	120
46	123
47	129
48	130
49	132
50	133
51	135
52	136
53	138
54	140
55	141
56	142
57	143
58	145
59	152
60	154
61	155
62	156
63	159
64	160
65	161
66	164
67	165
68	166
69	168
70	170

n	a(n)
1	10
2	15
3	21
4	22
5	30
6	33
7	34
8	35
9	39
10	40
11	42
12	46
13	51
14	52
15	55
16	57
17	58
18	60
19	65
20	66
21	69
22	70
23	77
24	78
25	82
26	84
27	85
28	87
29	88
30	90
31	91
32	93
33	94
34	95
35	98
36	102
37	105
38	106
39	110
40	111
41	114
42	115
43	118
44	119
45	120
46	123
47	129
48	130
49	132
50	133
51	135
52	136
53	138
54	140
55	141
56	142
57	143
58	145
59	152
60	154
61	155
62	156
63	159
64	160
65	161
66	164
67	165
68	166
69	168
70	170

n	a(n)
1	10
2	15
3	21
4	22
5	30
6	33
7	34
8	35
9	39
10	40
11	42
12	46
13	51
14	52
15	55
16	57
17	58
18	60
19	65
20	66
21	69
22	70
23	77
24	78
25	82
26	84
27	85
28	87
29	88
30	90
31	91
32	93
33	94
34	95
35	98
36	102
37	105
38	106
39	110
40	111
41	114
42	115
43	118
44	119
45	120
46	123
47	129
48	130
49	132
50	133
51	135
52	136
53	138
54	140
55	141
56	142
57	143
58	145
59	152
60	154
61	155
62	156
63	159
64	160
65	161
66	164
67	165
68	166
69	168
70	170