A077654 - cp's OEIS frontend

A077654 Composites k such that 2k+1 is also composite.

n	a(n)
1	4
2	10
3	12
4	16
5	22
6	24
7	25
8	27
9	28
10	32
11	34
12	38
13	40
14	42
15	45
16	46
17	49
18	52
19	55
20	57
21	58
22	60
23	62
24	64
25	66
26	70
27	72
28	76
29	77
30	80
31	82
32	84
33	85
34	87
35	88
36	91
37	92
38	93
39	94
40	100
41	102
42	104
43	106
44	108
45	110
46	112
47	115
48	117
49	118
50	121
51	122
52	123
53	124
54	126
55	129
56	130
57	132
58	133
59	136
60	142

[4, 10, 12, 16, 22, 24, 25, 27, 28, 32, 34, 38, 40, 42, 45, 46, 49, 52, 55, 57, 58, 60, 62, 64, 66, 70, 72, 76, 77, 80, 82, 84, 85, 87, 88, 91, 92, 93, 94, 100, 102, 104, 106, 108, 110, 112, 115, 117, 118, 121, 122, 123, 124, 126, 129, 130, 132, 133, 136, 142]

cp's OEIS Frontend

A077654 Composites k such that 2k+1 is also composite.

Table of values

List of values

n	a(n)
1	4
2	10
3	12
4	16
5	22
6	24
7	25
8	27
9	28
10	32
11	34
12	38
13	40
14	42
15	45
16	46
17	49
18	52
19	55
20	57
21	58
22	60
23	62
24	64
25	66
26	70
27	72
28	76
29	77
30	80
31	82
32	84
33	85
34	87
35	88
36	91
37	92
38	93
39	94
40	100
41	102
42	104
43	106
44	108
45	110
46	112
47	115
48	117
49	118
50	121
51	122
52	123
53	124
54	126
55	129
56	130
57	132
58	133
59	136
60	142

n	a(n)
1	4
2	10
3	12
4	16
5	22
6	24
7	25
8	27
9	28
10	32
11	34
12	38
13	40
14	42
15	45
16	46
17	49
18	52
19	55
20	57
21	58
22	60
23	62
24	64
25	66
26	70
27	72
28	76
29	77
30	80
31	82
32	84
33	85
34	87
35	88
36	91
37	92
38	93
39	94
40	100
41	102
42	104
43	106
44	108
45	110
46	112
47	115
48	117
49	118
50	121
51	122
52	123
53	124
54	126
55	129
56	130
57	132
58	133
59	136
60	142

n	a(n)
1	4
2	10
3	12
4	16
5	22
6	24
7	25
8	27
9	28
10	32
11	34
12	38
13	40
14	42
15	45
16	46
17	49
18	52
19	55
20	57
21	58
22	60
23	62
24	64
25	66
26	70
27	72
28	76
29	77
30	80
31	82
32	84
33	85
34	87
35	88
36	91
37	92
38	93
39	94
40	100
41	102
42	104
43	106
44	108
45	110
46	112
47	115
48	117
49	118
50	121
51	122
52	123
53	124
54	126
55	129
56	130
57	132
58	133
59	136
60	142