A248792 - cp's OEIS frontend

A248792 Numbers n such that sigma(n) - 1 is a prime p.

n	a(n)
1	2
2	3
3	5
4	6
5	7
6	10
7	11
8	13
9	14
10	15
11	17
12	19
13	20
14	21
15	23
16	24
17	26
18	29
19	30
20	31
21	33
22	34
23	35
24	37
25	38
26	40
27	41
28	43
29	44
30	46
31	47
32	51
33	52
34	53
35	55
36	57
37	58
38	59
39	60
40	61
41	63
42	65
43	67
44	71
45	73
46	74
47	76
48	78
49	79
50	83
51	84
52	85
53	86
54	88
55	89
56	90
57	92
58	93
59	96
60	97
61	101
62	103
63	105
64	107
65	109

[2, 3, 5, 6, 7, 10, 11, 13, 14, 15, 17, 19, 20, 21, 23, 24, 26, 29, 30, 31, 33, 34, 35, 37, 38, 40, 41, 43, 44, 46, 47, 51, 52, 53, 55, 57, 58, 59, 60, 61, 63, 65, 67, 71, 73, 74, 76, 78, 79, 83, 84, 85, 86, 88, 89, 90, 92, 93, 96, 97, 101, 103, 105, 107, 109]

cp's OEIS Frontend

A248792 Numbers n such that sigma(n) - 1 is a prime p.

Table of values

List of values

n	a(n)
1	2
2	3
3	5
4	6
5	7
6	10
7	11
8	13
9	14
10	15
11	17
12	19
13	20
14	21
15	23
16	24
17	26
18	29
19	30
20	31
21	33
22	34
23	35
24	37
25	38
26	40
27	41
28	43
29	44
30	46
31	47
32	51
33	52
34	53
35	55
36	57
37	58
38	59
39	60
40	61
41	63
42	65
43	67
44	71
45	73
46	74
47	76
48	78
49	79
50	83
51	84
52	85
53	86
54	88
55	89
56	90
57	92
58	93
59	96
60	97
61	101
62	103
63	105
64	107
65	109

n	a(n)
1	2
2	3
3	5
4	6
5	7
6	10
7	11
8	13
9	14
10	15
11	17
12	19
13	20
14	21
15	23
16	24
17	26
18	29
19	30
20	31
21	33
22	34
23	35
24	37
25	38
26	40
27	41
28	43
29	44
30	46
31	47
32	51
33	52
34	53
35	55
36	57
37	58
38	59
39	60
40	61
41	63
42	65
43	67
44	71
45	73
46	74
47	76
48	78
49	79
50	83
51	84
52	85
53	86
54	88
55	89
56	90
57	92
58	93
59	96
60	97
61	101
62	103
63	105
64	107
65	109

n	a(n)
1	2
2	3
3	5
4	6
5	7
6	10
7	11
8	13
9	14
10	15
11	17
12	19
13	20
14	21
15	23
16	24
17	26
18	29
19	30
20	31
21	33
22	34
23	35
24	37
25	38
26	40
27	41
28	43
29	44
30	46
31	47
32	51
33	52
34	53
35	55
36	57
37	58
38	59
39	60
40	61
41	63
42	65
43	67
44	71
45	73
46	74
47	76
48	78
49	79
50	83
51	84
52	85
53	86
54	88
55	89
56	90
57	92
58	93
59	96
60	97
61	101
62	103
63	105
64	107
65	109