A259558 - cp's OEIS frontend

A259558 Numbers n such that prime(n)-1 and prime(n+1)-1 have the same number of distinct prime factors.

n	a(n)
1	2
2	4
3	5
4	8
5	9
6	12
7	15
8	16
9	18
10	19
11	23
12	24
13	25
14	28
15	29
16	31
17	36
18	38
19	39
20	40
21	42
22	44
23	52
24	56
25	58
26	59
27	60
28	63
29	64
30	71
31	73
32	74
33	76
34	80
35	85
36	88
37	91
38	92
39	94
40	96
41	98
42	99
43	102
44	103
45	106
46	107
47	109
48	110
49	111
50	112
51	113
52	117
53	126
54	129
55	130
56	131
57	132
58	133
59	134
60	136
61	139
62	141
63	142
64	143
65	144
66	151
67	152
68	159
69	160
70	161
71	165
72	168
73	169
74	173

[2, 4, 5, 8, 9, 12, 15, 16, 18, 19, 23, 24, 25, 28, 29, 31, 36, 38, 39, 40, 42, 44, 52, 56, 58, 59, 60, 63, 64, 71, 73, 74, 76, 80, 85, 88, 91, 92, 94, 96, 98, 99, 102, 103, 106, 107, 109, 110, 111, 112, 113, 117, 126, 129, 130, 131, 132, 133, 134, 136, 139, 141, 142, 143, 144, 151, 152, 159, 160, 161, 165, 168, 169, 173]

cp's OEIS Frontend

A259558 Numbers n such that prime(n)-1 and prime(n+1)-1 have the same number of distinct prime factors.

Table of values

List of values

n	a(n)
1	2
2	4
3	5
4	8
5	9
6	12
7	15
8	16
9	18
10	19
11	23
12	24
13	25
14	28
15	29
16	31
17	36
18	38
19	39
20	40
21	42
22	44
23	52
24	56
25	58
26	59
27	60
28	63
29	64
30	71
31	73
32	74
33	76
34	80
35	85
36	88
37	91
38	92
39	94
40	96
41	98
42	99
43	102
44	103
45	106
46	107
47	109
48	110
49	111
50	112
51	113
52	117
53	126
54	129
55	130
56	131
57	132
58	133
59	134
60	136
61	139
62	141
63	142
64	143
65	144
66	151
67	152
68	159
69	160
70	161
71	165
72	168
73	169
74	173

n	a(n)
1	2
2	4
3	5
4	8
5	9
6	12
7	15
8	16
9	18
10	19
11	23
12	24
13	25
14	28
15	29
16	31
17	36
18	38
19	39
20	40
21	42
22	44
23	52
24	56
25	58
26	59
27	60
28	63
29	64
30	71
31	73
32	74
33	76
34	80
35	85
36	88
37	91
38	92
39	94
40	96
41	98
42	99
43	102
44	103
45	106
46	107
47	109
48	110
49	111
50	112
51	113
52	117
53	126
54	129
55	130
56	131
57	132
58	133
59	134
60	136
61	139
62	141
63	142
64	143
65	144
66	151
67	152
68	159
69	160
70	161
71	165
72	168
73	169
74	173

n	a(n)
1	2
2	4
3	5
4	8
5	9
6	12
7	15
8	16
9	18
10	19
11	23
12	24
13	25
14	28
15	29
16	31
17	36
18	38
19	39
20	40
21	42
22	44
23	52
24	56
25	58
26	59
27	60
28	63
29	64
30	71
31	73
32	74
33	76
34	80
35	85
36	88
37	91
38	92
39	94
40	96
41	98
42	99
43	102
44	103
45	106
46	107
47	109
48	110
49	111
50	112
51	113
52	117
53	126
54	129
55	130
56	131
57	132
58	133
59	134
60	136
61	139
62	141
63	142
64	143
65	144
66	151
67	152
68	159
69	160
70	161
71	165
72	168
73	169
74	173