A347886 - cp's OEIS frontend

A347886 Odd numbers k such that sigma(k^2) has an even number of prime factors when counted with multiplicity.

n	a(n)
1	1
2	7
3	9
4	11
5	13
6	15
7	19
8	23
9	25
10	29
11	31
12	43
13	47
14	51
15	53
16	63
17	67
18	73
19	77
20	79
21	81
22	83
23	85
24	91
25	97
26	99
27	103
28	105
29	111
30	113
31	117
32	121
33	123
34	127
35	133
36	135
37	143
38	147
39	157
40	161
41	163
42	165
43	171
44	175
45	177
46	179
47	183
48	185
49	191
50	195
51	197
52	199
53	203
54	205
55	207
56	209
57	211
58	213
59	217
60	223
61	225
62	227
63	233
64	239
65	241
66	243
67	245
68	247
69	251
70	253

[1, 7, 9, 11, 13, 15, 19, 23, 25, 29, 31, 43, 47, 51, 53, 63, 67, 73, 77, 79, 81, 83, 85, 91, 97, 99, 103, 105, 111, 113, 117, 121, 123, 127, 133, 135, 143, 147, 157, 161, 163, 165, 171, 175, 177, 179, 183, 185, 191, 195, 197, 199, 203, 205, 207, 209, 211, 213, 217, 223, 225, 227, 233, 239, 241, 243, 245, 247, 251, 253]

cp's OEIS Frontend

A347886 Odd numbers k such that sigma(k^2) has an even number of prime factors when counted with multiplicity.

Table of values

List of values

n	a(n)
1	1
2	7
3	9
4	11
5	13
6	15
7	19
8	23
9	25
10	29
11	31
12	43
13	47
14	51
15	53
16	63
17	67
18	73
19	77
20	79
21	81
22	83
23	85
24	91
25	97
26	99
27	103
28	105
29	111
30	113
31	117
32	121
33	123
34	127
35	133
36	135
37	143
38	147
39	157
40	161
41	163
42	165
43	171
44	175
45	177
46	179
47	183
48	185
49	191
50	195
51	197
52	199
53	203
54	205
55	207
56	209
57	211
58	213
59	217
60	223
61	225
62	227
63	233
64	239
65	241
66	243
67	245
68	247
69	251
70	253

n	a(n)
1	1
2	7
3	9
4	11
5	13
6	15
7	19
8	23
9	25
10	29
11	31
12	43
13	47
14	51
15	53
16	63
17	67
18	73
19	77
20	79
21	81
22	83
23	85
24	91
25	97
26	99
27	103
28	105
29	111
30	113
31	117
32	121
33	123
34	127
35	133
36	135
37	143
38	147
39	157
40	161
41	163
42	165
43	171
44	175
45	177
46	179
47	183
48	185
49	191
50	195
51	197
52	199
53	203
54	205
55	207
56	209
57	211
58	213
59	217
60	223
61	225
62	227
63	233
64	239
65	241
66	243
67	245
68	247
69	251
70	253

n	a(n)
1	1
2	7
3	9
4	11
5	13
6	15
7	19
8	23
9	25
10	29
11	31
12	43
13	47
14	51
15	53
16	63
17	67
18	73
19	77
20	79
21	81
22	83
23	85
24	91
25	97
26	99
27	103
28	105
29	111
30	113
31	117
32	121
33	123
34	127
35	133
36	135
37	143
38	147
39	157
40	161
41	163
42	165
43	171
44	175
45	177
46	179
47	183
48	185
49	191
50	195
51	197
52	199
53	203
54	205
55	207
56	209
57	211
58	213
59	217
60	223
61	225
62	227
63	233
64	239
65	241
66	243
67	245
68	247
69	251
70	253