A121837 - cp's OEIS frontend

A121837 Least positive j such that Product_{k=1..n} D(k) + j is prime, where D() are the doublets, A020338.

n	a(n)
1	2
2	9
3	7
4	7
5	17
6	7
7	29
8	17
9	19
10	23
11	23
12	13
13	29
14	79
15	19
16	89
17	97
18	53
19	43
20	347
21	127
22	127
23	149
24	29
25	167
26	331
27	379
28	61
29	59
30	167
31	199
32	557
33	107
34	113
35	43
36	191
37	439
38	41
39	263
40	227
41	109
42	71
43	227
44	137
45	149
46	409
47	271
48	53
49	157
50	79
51	503
52	103
53	461
54	137
55	587
56	233
57	491
58	73
59	367
60	233
61	449

[2, 9, 7, 7, 17, 7, 29, 17, 19, 23, 23, 13, 29, 79, 19, 89, 97, 53, 43, 347, 127, 127, 149, 29, 167, 331, 379, 61, 59, 167, 199, 557, 107, 113, 43, 191, 439, 41, 263, 227, 109, 71, 227, 137, 149, 409, 271, 53, 157, 79, 503, 103, 461, 137, 587, 233, 491, 73, 367, 233, 449]

cp's OEIS Frontend

A121837 Least positive j such that Product_{k=1..n} D(k) + j is prime, where D() are the doublets, A020338.

Table of values

List of values

n	a(n)
1	2
2	9
3	7
4	7
5	17
6	7
7	29
8	17
9	19
10	23
11	23
12	13
13	29
14	79
15	19
16	89
17	97
18	53
19	43
20	347
21	127
22	127
23	149
24	29
25	167
26	331
27	379
28	61
29	59
30	167
31	199
32	557
33	107
34	113
35	43
36	191
37	439
38	41
39	263
40	227
41	109
42	71
43	227
44	137
45	149
46	409
47	271
48	53
49	157
50	79
51	503
52	103
53	461
54	137
55	587
56	233
57	491
58	73
59	367
60	233
61	449

n	a(n)
1	2
2	9
3	7
4	7
5	17
6	7
7	29
8	17
9	19
10	23
11	23
12	13
13	29
14	79
15	19
16	89
17	97
18	53
19	43
20	347
21	127
22	127
23	149
24	29
25	167
26	331
27	379
28	61
29	59
30	167
31	199
32	557
33	107
34	113
35	43
36	191
37	439
38	41
39	263
40	227
41	109
42	71
43	227
44	137
45	149
46	409
47	271
48	53
49	157
50	79
51	503
52	103
53	461
54	137
55	587
56	233
57	491
58	73
59	367
60	233
61	449

n	a(n)
1	2
2	9
3	7
4	7
5	17
6	7
7	29
8	17
9	19
10	23
11	23
12	13
13	29
14	79
15	19
16	89
17	97
18	53
19	43
20	347
21	127
22	127
23	149
24	29
25	167
26	331
27	379
28	61
29	59
30	167
31	199
32	557
33	107
34	113
35	43
36	191
37	439
38	41
39	263
40	227
41	109
42	71
43	227
44	137
45	149
46	409
47	271
48	53
49	157
50	79
51	503
52	103
53	461
54	137
55	587
56	233
57	491
58	73
59	367
60	233
61	449