A164702 - cp's OEIS frontend

A164702 Write n in binary. Insert one 0 right of any one 1. a(n) is the smallest possible composite equal to the value of any such resulting binary number.

n	a(n)
2	4
3	6
4	8
5	9
6	10
7	14
8	16
9	18
10	18
11	21
12	20
13	21
14	22
15	27
16	32
17	33
18	34
19	35
20	36
21	42
22	38
23	39
24	40
25	49
26	42
27	51
28	44
29	45
30	46
31	55
32	64
33	65
34	66
35	69
36	68
37	69
38	70
39	75
40	72
41	81
42	74
43	75
44	76
45	77
46	78
47	87
48	80
49	81
50	82
51	99
52	84
53	85
54	86
55	87
56	88
57	105
58	90
59	91
60	92
61	93
62	94
63	95
64	128
65	129
66	130
67	133
68	132
69	133
70	134

[4, 6, 8, 9, 10, 14, 16, 18, 18, 21, 20, 21, 22, 27, 32, 33, 34, 35, 36, 42, 38, 39, 40, 49, 42, 51, 44, 45, 46, 55, 64, 65, 66, 69, 68, 69, 70, 75, 72, 81, 74, 75, 76, 77, 78, 87, 80, 81, 82, 99, 84, 85, 86, 87, 88, 105, 90, 91, 92, 93, 94, 95, 128, 129, 130, 133, 132, 133, 134]

cp's OEIS Frontend

A164702 Write n in binary. Insert one 0 right of any one 1. a(n) is the smallest possible composite equal to the value of any such resulting binary number.

Table of values

List of values

n	a(n)
2	4
3	6
4	8
5	9
6	10
7	14
8	16
9	18
10	18
11	21
12	20
13	21
14	22
15	27
16	32
17	33
18	34
19	35
20	36
21	42
22	38
23	39
24	40
25	49
26	42
27	51
28	44
29	45
30	46
31	55
32	64
33	65
34	66
35	69
36	68
37	69
38	70
39	75
40	72
41	81
42	74
43	75
44	76
45	77
46	78
47	87
48	80
49	81
50	82
51	99
52	84
53	85
54	86
55	87
56	88
57	105
58	90
59	91
60	92
61	93
62	94
63	95
64	128
65	129
66	130
67	133
68	132
69	133
70	134

n	a(n)
2	4
3	6
4	8
5	9
6	10
7	14
8	16
9	18
10	18
11	21
12	20
13	21
14	22
15	27
16	32
17	33
18	34
19	35
20	36
21	42
22	38
23	39
24	40
25	49
26	42
27	51
28	44
29	45
30	46
31	55
32	64
33	65
34	66
35	69
36	68
37	69
38	70
39	75
40	72
41	81
42	74
43	75
44	76
45	77
46	78
47	87
48	80
49	81
50	82
51	99
52	84
53	85
54	86
55	87
56	88
57	105
58	90
59	91
60	92
61	93
62	94
63	95
64	128
65	129
66	130
67	133
68	132
69	133
70	134

n	a(n)
2	4
3	6
4	8
5	9
6	10
7	14
8	16
9	18
10	18
11	21
12	20
13	21
14	22
15	27
16	32
17	33
18	34
19	35
20	36
21	42
22	38
23	39
24	40
25	49
26	42
27	51
28	44
29	45
30	46
31	55
32	64
33	65
34	66
35	69
36	68
37	69
38	70
39	75
40	72
41	81
42	74
43	75
44	76
45	77
46	78
47	87
48	80
49	81
50	82
51	99
52	84
53	85
54	86
55	87
56	88
57	105
58	90
59	91
60	92
61	93
62	94
63	95
64	128
65	129
66	130
67	133
68	132
69	133
70	134