A249801 - cp's OEIS frontend

A249801 Take smallest prime q such that n*(q+1)+1 is prime (A249800), that is, the smallest prime q so that n = (p-1)/(q+1) with p prime; sequence gives values of p; or -1 if A249800(n) = -1.

n	a(n)
1	5
2	7
3	13
4	13
5	31
6	19
7	29
8	97
9	37
10	31
11	67
12	37
13	53
14	43
15	61
16	97
17	103
18	73
19	229
20	61
21	127
22	67
23	139
24	73
25	101
26	79
27	109
28	113
29	233
30	181
31	373
32	97
33	199
34	103
35	211
36	109
37	149
38	229
39	157
40	241
41	739
42	127
43	173
44	353
45	181
46	139
47	283
48	193
49	197
50	151
51	307
52	157
53	743
54	163
55	331
56	337
57	229

[5, 7, 13, 13, 31, 19, 29, 97, 37, 31, 67, 37, 53, 43, 61, 97, 103, 73, 229, 61, 127, 67, 139, 73, 101, 79, 109, 113, 233, 181, 373, 97, 199, 103, 211, 109, 149, 229, 157, 241, 739, 127, 173, 353, 181, 139, 283, 193, 197, 151, 307, 157, 743, 163, 331, 337, 229]

cp's OEIS Frontend

A249801 Take smallest prime q such that n*(q+1)+1 is prime (A249800), that is, the smallest prime q so that n = (p-1)/(q+1) with p prime; sequence gives values of p; or -1 if A249800(n) = -1.

Table of values

List of values

n	a(n)
1	5
2	7
3	13
4	13
5	31
6	19
7	29
8	97
9	37
10	31
11	67
12	37
13	53
14	43
15	61
16	97
17	103
18	73
19	229
20	61
21	127
22	67
23	139
24	73
25	101
26	79
27	109
28	113
29	233
30	181
31	373
32	97
33	199
34	103
35	211
36	109
37	149
38	229
39	157
40	241
41	739
42	127
43	173
44	353
45	181
46	139
47	283
48	193
49	197
50	151
51	307
52	157
53	743
54	163
55	331
56	337
57	229

n	a(n)
1	5
2	7
3	13
4	13
5	31
6	19
7	29
8	97
9	37
10	31
11	67
12	37
13	53
14	43
15	61
16	97
17	103
18	73
19	229
20	61
21	127
22	67
23	139
24	73
25	101
26	79
27	109
28	113
29	233
30	181
31	373
32	97
33	199
34	103
35	211
36	109
37	149
38	229
39	157
40	241
41	739
42	127
43	173
44	353
45	181
46	139
47	283
48	193
49	197
50	151
51	307
52	157
53	743
54	163
55	331
56	337
57	229

n	a(n)
1	5
2	7
3	13
4	13
5	31
6	19
7	29
8	97
9	37
10	31
11	67
12	37
13	53
14	43
15	61
16	97
17	103
18	73
19	229
20	61
21	127
22	67
23	139
24	73
25	101
26	79
27	109
28	113
29	233
30	181
31	373
32	97
33	199
34	103
35	211
36	109
37	149
38	229
39	157
40	241
41	739
42	127
43	173
44	353
45	181
46	139
47	283
48	193
49	197
50	151
51	307
52	157
53	743
54	163
55	331
56	337
57	229