A193071 - cp's OEIS frontend

A193071 Odd numbers N for which sigma(N^2) is not prime.

n	a(n)
1	1
2	7
3	9
4	11
5	13
6	15
7	19
8	21
9	23
10	25
11	29
12	31
13	33
14	35
15	37
16	39
17	43
18	45
19	47
20	51
21	53
22	55
23	57
24	61
25	63
26	65
27	67
28	69
29	73
30	75
31	77
32	79
33	81
34	83
35	85
36	87
37	91
38	93
39	95
40	97
41	99
42	103
43	105
44	107
45	109
46	111
47	113
48	115
49	117
50	119
51	121
52	123
53	127
54	129
55	133
56	135
57	137
58	139
59	141
60	143
61	145
62	147

[1, 7, 9, 11, 13, 15, 19, 21, 23, 25, 29, 31, 33, 35, 37, 39, 43, 45, 47, 51, 53, 55, 57, 61, 63, 65, 67, 69, 73, 75, 77, 79, 81, 83, 85, 87, 91, 93, 95, 97, 99, 103, 105, 107, 109, 111, 113, 115, 117, 119, 121, 123, 127, 129, 133, 135, 137, 139, 141, 143, 145, 147]

cp's OEIS Frontend

A193071 Odd numbers N for which sigma(N^2) is not prime.

Table of values

List of values

n	a(n)
1	1
2	7
3	9
4	11
5	13
6	15
7	19
8	21
9	23
10	25
11	29
12	31
13	33
14	35
15	37
16	39
17	43
18	45
19	47
20	51
21	53
22	55
23	57
24	61
25	63
26	65
27	67
28	69
29	73
30	75
31	77
32	79
33	81
34	83
35	85
36	87
37	91
38	93
39	95
40	97
41	99
42	103
43	105
44	107
45	109
46	111
47	113
48	115
49	117
50	119
51	121
52	123
53	127
54	129
55	133
56	135
57	137
58	139
59	141
60	143
61	145
62	147

n	a(n)
1	1
2	7
3	9
4	11
5	13
6	15
7	19
8	21
9	23
10	25
11	29
12	31
13	33
14	35
15	37
16	39
17	43
18	45
19	47
20	51
21	53
22	55
23	57
24	61
25	63
26	65
27	67
28	69
29	73
30	75
31	77
32	79
33	81
34	83
35	85
36	87
37	91
38	93
39	95
40	97
41	99
42	103
43	105
44	107
45	109
46	111
47	113
48	115
49	117
50	119
51	121
52	123
53	127
54	129
55	133
56	135
57	137
58	139
59	141
60	143
61	145
62	147

n	a(n)
1	1
2	7
3	9
4	11
5	13
6	15
7	19
8	21
9	23
10	25
11	29
12	31
13	33
14	35
15	37
16	39
17	43
18	45
19	47
20	51
21	53
22	55
23	57
24	61
25	63
26	65
27	67
28	69
29	73
30	75
31	77
32	79
33	81
34	83
35	85
36	87
37	91
38	93
39	95
40	97
41	99
42	103
43	105
44	107
45	109
46	111
47	113
48	115
49	117
50	119
51	121
52	123
53	127
54	129
55	133
56	135
57	137
58	139
59	141
60	143
61	145
62	147