A032684 - cp's OEIS frontend

A032684 Numbers k such that k surrounded by digit '7' is prime.

n	a(n)
1	2
2	5
3	8
4	9
5	12
6	17
7	18
8	20
9	23
10	24
11	29
12	30
13	41
14	45
15	47
16	48
17	50
18	51
19	53
20	54
21	57
22	60
23	68
24	71
25	72
26	75
27	81
28	86
29	87
30	90
31	92
32	93
33	114
34	116
35	123
36	125
37	128
38	131
39	132
40	134
41	138
42	143
43	152
44	153
45	159
46	164
47	170
48	177
49	180
50	183
51	186
52	188
53	191
54	194
55	198
56	204
57	207

[2, 5, 8, 9, 12, 17, 18, 20, 23, 24, 29, 30, 41, 45, 47, 48, 50, 51, 53, 54, 57, 60, 68, 71, 72, 75, 81, 86, 87, 90, 92, 93, 114, 116, 123, 125, 128, 131, 132, 134, 138, 143, 152, 153, 159, 164, 170, 177, 180, 183, 186, 188, 191, 194, 198, 204, 207]

cp's OEIS Frontend

A032684 Numbers k such that k surrounded by digit '7' is prime.

Table of values

List of values

n	a(n)
1	2
2	5
3	8
4	9
5	12
6	17
7	18
8	20
9	23
10	24
11	29
12	30
13	41
14	45
15	47
16	48
17	50
18	51
19	53
20	54
21	57
22	60
23	68
24	71
25	72
26	75
27	81
28	86
29	87
30	90
31	92
32	93
33	114
34	116
35	123
36	125
37	128
38	131
39	132
40	134
41	138
42	143
43	152
44	153
45	159
46	164
47	170
48	177
49	180
50	183
51	186
52	188
53	191
54	194
55	198
56	204
57	207

n	a(n)
1	2
2	5
3	8
4	9
5	12
6	17
7	18
8	20
9	23
10	24
11	29
12	30
13	41
14	45
15	47
16	48
17	50
18	51
19	53
20	54
21	57
22	60
23	68
24	71
25	72
26	75
27	81
28	86
29	87
30	90
31	92
32	93
33	114
34	116
35	123
36	125
37	128
38	131
39	132
40	134
41	138
42	143
43	152
44	153
45	159
46	164
47	170
48	177
49	180
50	183
51	186
52	188
53	191
54	194
55	198
56	204
57	207

n	a(n)
1	2
2	5
3	8
4	9
5	12
6	17
7	18
8	20
9	23
10	24
11	29
12	30
13	41
14	45
15	47
16	48
17	50
18	51
19	53
20	54
21	57
22	60
23	68
24	71
25	72
26	75
27	81
28	86
29	87
30	90
31	92
32	93
33	114
34	116
35	123
36	125
37	128
38	131
39	132
40	134
41	138
42	143
43	152
44	153
45	159
46	164
47	170
48	177
49	180
50	183
51	186
52	188
53	191
54	194
55	198
56	204
57	207