A039698 - cp's OEIS frontend

A039698 Numbers k such that phi(k) + 1 is prime.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	10
11	11
12	12
13	13
14	14
15	17
16	18
17	19
18	21
19	22
20	23
21	26
22	27
23	28
24	29
25	31
26	32
27	34
28	36
29	37
30	38
31	40
32	41
33	42
34	43
35	46
36	47
37	48
38	49
39	53
40	54
41	55
42	57
43	58
44	59
45	60
46	61
47	62
48	63
49	67
50	71
51	73
52	74
53	75
54	76
55	77
56	79
57	82
58	83
59	86
60	88
61	89
62	91
63	93
64	94
65	95
66	97
67	98
68	99
69	100
70	101
71	103

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 17, 18, 19, 21, 22, 23, 26, 27, 28, 29, 31, 32, 34, 36, 37, 38, 40, 41, 42, 43, 46, 47, 48, 49, 53, 54, 55, 57, 58, 59, 60, 61, 62, 63, 67, 71, 73, 74, 75, 76, 77, 79, 82, 83, 86, 88, 89, 91, 93, 94, 95, 97, 98, 99, 100, 101, 103]

cp's OEIS Frontend

A039698 Numbers k such that phi(k) + 1 is prime.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	10
11	11
12	12
13	13
14	14
15	17
16	18
17	19
18	21
19	22
20	23
21	26
22	27
23	28
24	29
25	31
26	32
27	34
28	36
29	37
30	38
31	40
32	41
33	42
34	43
35	46
36	47
37	48
38	49
39	53
40	54
41	55
42	57
43	58
44	59
45	60
46	61
47	62
48	63
49	67
50	71
51	73
52	74
53	75
54	76
55	77
56	79
57	82
58	83
59	86
60	88
61	89
62	91
63	93
64	94
65	95
66	97
67	98
68	99
69	100
70	101
71	103

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	10
11	11
12	12
13	13
14	14
15	17
16	18
17	19
18	21
19	22
20	23
21	26
22	27
23	28
24	29
25	31
26	32
27	34
28	36
29	37
30	38
31	40
32	41
33	42
34	43
35	46
36	47
37	48
38	49
39	53
40	54
41	55
42	57
43	58
44	59
45	60
46	61
47	62
48	63
49	67
50	71
51	73
52	74
53	75
54	76
55	77
56	79
57	82
58	83
59	86
60	88
61	89
62	91
63	93
64	94
65	95
66	97
67	98
68	99
69	100
70	101
71	103

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	10
11	11
12	12
13	13
14	14
15	17
16	18
17	19
18	21
19	22
20	23
21	26
22	27
23	28
24	29
25	31
26	32
27	34
28	36
29	37
30	38
31	40
32	41
33	42
34	43
35	46
36	47
37	48
38	49
39	53
40	54
41	55
42	57
43	58
44	59
45	60
46	61
47	62
48	63
49	67
50	71
51	73
52	74
53	75
54	76
55	77
56	79
57	82
58	83
59	86
60	88
61	89
62	91
63	93
64	94
65	95
66	97
67	98
68	99
69	100
70	101
71	103