A109928 - cp's OEIS frontend

A109928 Least k such that there are n primes of the form kr+1 with 1<=r<=k. Index of the first occurrence of n in A085053.

n	a(n)
1	1
2	2
3	4
4	13
5	6
6	10
7	20
8	47
9	22
10	18
11	28
12	34
13	51
14	40
15	62
16	36
17	30
18	50
19	48
20	74
21	42
22	82
23	80
24	54
25	105
26	72
27	60
28	147
29	78
30	66
31	116
32	134
33	84
34	96
35	142
36	146
37	108
38	90
39	114
40	102
41	172
42	206
43	130
44	160
45	226
46	120
47	144
48	138
49	126
50	196
51	248
52	262
53	162
54	170
55	302
56	156
57	186
58	274
59	356
60	174

[1, 2, 4, 13, 6, 10, 20, 47, 22, 18, 28, 34, 51, 40, 62, 36, 30, 50, 48, 74, 42, 82, 80, 54, 105, 72, 60, 147, 78, 66, 116, 134, 84, 96, 142, 146, 108, 90, 114, 102, 172, 206, 130, 160, 226, 120, 144, 138, 126, 196, 248, 262, 162, 170, 302, 156, 186, 274, 356, 174]

cp's OEIS Frontend

A109928 Least k such that there are n primes of the form kr+1 with 1<=r<=k. Index of the first occurrence of n in A085053.

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	13
5	6
6	10
7	20
8	47
9	22
10	18
11	28
12	34
13	51
14	40
15	62
16	36
17	30
18	50
19	48
20	74
21	42
22	82
23	80
24	54
25	105
26	72
27	60
28	147
29	78
30	66
31	116
32	134
33	84
34	96
35	142
36	146
37	108
38	90
39	114
40	102
41	172
42	206
43	130
44	160
45	226
46	120
47	144
48	138
49	126
50	196
51	248
52	262
53	162
54	170
55	302
56	156
57	186
58	274
59	356
60	174

n	a(n)
1	1
2	2
3	4
4	13
5	6
6	10
7	20
8	47
9	22
10	18
11	28
12	34
13	51
14	40
15	62
16	36
17	30
18	50
19	48
20	74
21	42
22	82
23	80
24	54
25	105
26	72
27	60
28	147
29	78
30	66
31	116
32	134
33	84
34	96
35	142
36	146
37	108
38	90
39	114
40	102
41	172
42	206
43	130
44	160
45	226
46	120
47	144
48	138
49	126
50	196
51	248
52	262
53	162
54	170
55	302
56	156
57	186
58	274
59	356
60	174

n	a(n)
1	1
2	2
3	4
4	13
5	6
6	10
7	20
8	47
9	22
10	18
11	28
12	34
13	51
14	40
15	62
16	36
17	30
18	50
19	48
20	74
21	42
22	82
23	80
24	54
25	105
26	72
27	60
28	147
29	78
30	66
31	116
32	134
33	84
34	96
35	142
36	146
37	108
38	90
39	114
40	102
41	172
42	206
43	130
44	160
45	226
46	120
47	144
48	138
49	126
50	196
51	248
52	262
53	162
54	170
55	302
56	156
57	186
58	274
59	356
60	174