A259185 - cp's OEIS frontend

A259185 Numbers n such that 1 - sigma(n) + sigma(n)^2 is prime.

n	a(n)
1	2
2	3
3	4
4	5
5	8
6	9
7	10
8	12
9	17
10	18
11	20
12	24
13	26
14	30
15	32
16	36
17	38
18	40
19	41
20	45
21	46
22	51
23	54
24	55
25	56
26	58
27	59
28	60
29	66
30	70
31	71
32	72
33	78
34	86
35	87
36	89
37	91
38	92
39	94
40	95
41	99
42	101
43	102
44	104
45	106
46	108
47	110
48	115
49	116
50	119
51	123
52	125
53	131
54	134
55	138
56	142
57	143
58	144
59	154
60	159
61	164

[2, 3, 4, 5, 8, 9, 10, 12, 17, 18, 20, 24, 26, 30, 32, 36, 38, 40, 41, 45, 46, 51, 54, 55, 56, 58, 59, 60, 66, 70, 71, 72, 78, 86, 87, 89, 91, 92, 94, 95, 99, 101, 102, 104, 106, 108, 110, 115, 116, 119, 123, 125, 131, 134, 138, 142, 143, 144, 154, 159, 164]

cp's OEIS Frontend

A259185 Numbers n such that 1 - sigma(n) + sigma(n)^2 is prime.

Table of values

List of values

n	a(n)
1	2
2	3
3	4
4	5
5	8
6	9
7	10
8	12
9	17
10	18
11	20
12	24
13	26
14	30
15	32
16	36
17	38
18	40
19	41
20	45
21	46
22	51
23	54
24	55
25	56
26	58
27	59
28	60
29	66
30	70
31	71
32	72
33	78
34	86
35	87
36	89
37	91
38	92
39	94
40	95
41	99
42	101
43	102
44	104
45	106
46	108
47	110
48	115
49	116
50	119
51	123
52	125
53	131
54	134
55	138
56	142
57	143
58	144
59	154
60	159
61	164

n	a(n)
1	2
2	3
3	4
4	5
5	8
6	9
7	10
8	12
9	17
10	18
11	20
12	24
13	26
14	30
15	32
16	36
17	38
18	40
19	41
20	45
21	46
22	51
23	54
24	55
25	56
26	58
27	59
28	60
29	66
30	70
31	71
32	72
33	78
34	86
35	87
36	89
37	91
38	92
39	94
40	95
41	99
42	101
43	102
44	104
45	106
46	108
47	110
48	115
49	116
50	119
51	123
52	125
53	131
54	134
55	138
56	142
57	143
58	144
59	154
60	159
61	164

n	a(n)
1	2
2	3
3	4
4	5
5	8
6	9
7	10
8	12
9	17
10	18
11	20
12	24
13	26
14	30
15	32
16	36
17	38
18	40
19	41
20	45
21	46
22	51
23	54
24	55
25	56
26	58
27	59
28	60
29	66
30	70
31	71
32	72
33	78
34	86
35	87
36	89
37	91
38	92
39	94
40	95
41	99
42	101
43	102
44	104
45	106
46	108
47	110
48	115
49	116
50	119
51	123
52	125
53	131
54	134
55	138
56	142
57	143
58	144
59	154
60	159
61	164