A032721 - cp's OEIS frontend

A032721 Numbers k such that k prefixed by '4' and followed by '7' is prime.

n	a(n)
1	5
2	6
3	8
4	12
5	15
6	17
7	21
8	29
9	32
10	33
11	35
12	39
13	44
14	45
15	50
16	51
17	54
18	56
19	59
20	63
21	65
22	78
23	81
24	87
25	93
26	95
27	96
28	98
29	101
30	104
31	105
32	107
33	111
34	117
35	122
36	125
37	135
38	138
39	146
40	150
41	159
42	161
43	162
44	164
45	168
46	173
47	177
48	188
49	189
50	192
51	194
52	195
53	201
54	215
55	218
56	219
57	222
58	225

[5, 6, 8, 12, 15, 17, 21, 29, 32, 33, 35, 39, 44, 45, 50, 51, 54, 56, 59, 63, 65, 78, 81, 87, 93, 95, 96, 98, 101, 104, 105, 107, 111, 117, 122, 125, 135, 138, 146, 150, 159, 161, 162, 164, 168, 173, 177, 188, 189, 192, 194, 195, 201, 215, 218, 219, 222, 225]

cp's OEIS Frontend

A032721 Numbers k such that k prefixed by '4' and followed by '7' is prime.

Table of values

List of values

n	a(n)
1	5
2	6
3	8
4	12
5	15
6	17
7	21
8	29
9	32
10	33
11	35
12	39
13	44
14	45
15	50
16	51
17	54
18	56
19	59
20	63
21	65
22	78
23	81
24	87
25	93
26	95
27	96
28	98
29	101
30	104
31	105
32	107
33	111
34	117
35	122
36	125
37	135
38	138
39	146
40	150
41	159
42	161
43	162
44	164
45	168
46	173
47	177
48	188
49	189
50	192
51	194
52	195
53	201
54	215
55	218
56	219
57	222
58	225

n	a(n)
1	5
2	6
3	8
4	12
5	15
6	17
7	21
8	29
9	32
10	33
11	35
12	39
13	44
14	45
15	50
16	51
17	54
18	56
19	59
20	63
21	65
22	78
23	81
24	87
25	93
26	95
27	96
28	98
29	101
30	104
31	105
32	107
33	111
34	117
35	122
36	125
37	135
38	138
39	146
40	150
41	159
42	161
43	162
44	164
45	168
46	173
47	177
48	188
49	189
50	192
51	194
52	195
53	201
54	215
55	218
56	219
57	222
58	225

n	a(n)
1	5
2	6
3	8
4	12
5	15
6	17
7	21
8	29
9	32
10	33
11	35
12	39
13	44
14	45
15	50
16	51
17	54
18	56
19	59
20	63
21	65
22	78
23	81
24	87
25	93
26	95
27	96
28	98
29	101
30	104
31	105
32	107
33	111
34	117
35	122
36	125
37	135
38	138
39	146
40	150
41	159
42	161
43	162
44	164
45	168
46	173
47	177
48	188
49	189
50	192
51	194
52	195
53	201
54	215
55	218
56	219
57	222
58	225