A211188 - cp's OEIS frontend

A211188 a(n) is the number of distinct prime divisors among all the composites of the form k^2 + 1 between the two primes A002496(n) and A002496(n+1).

n	a(n)
1	0
2	2
3	2
4	4
5	5
6	2
7	5
8	6
9	2
10	13
11	5
12	17
13	3
14	12
15	11
16	15
17	9
18	6
19	21
20	11
21	6
22	7
23	3
24	7
25	7
26	18
27	7
28	10
29	6
30	14
31	11
32	7
33	6
34	29
35	2
36	6
37	22
38	10
39	10
40	6
41	16
42	12
43	6
44	5
45	11
46	15
47	6
48	24
49	12
50	13
51	19
52	21
53	15
54	45
55	3
56	17
57	6
58	11
59	24
60	15
61	9
62	9
63	6
64	28
65	3
66	7
67	7
68	26
69	10
70	55
71	14
72	21
73	24
74	8

[0, 2, 2, 4, 5, 2, 5, 6, 2, 13, 5, 17, 3, 12, 11, 15, 9, 6, 21, 11, 6, 7, 3, 7, 7, 18, 7, 10, 6, 14, 11, 7, 6, 29, 2, 6, 22, 10, 10, 6, 16, 12, 6, 5, 11, 15, 6, 24, 12, 13, 19, 21, 15, 45, 3, 17, 6, 11, 24, 15, 9, 9, 6, 28, 3, 7, 7, 26, 10, 55, 14, 21, 24, 8]

cp's OEIS Frontend

A211188 a(n) is the number of distinct prime divisors among all the composites of the form k^2 + 1 between the two primes A002496(n) and A002496(n+1).

Table of values

List of values

n	a(n)
1	0
2	2
3	2
4	4
5	5
6	2
7	5
8	6
9	2
10	13
11	5
12	17
13	3
14	12
15	11
16	15
17	9
18	6
19	21
20	11
21	6
22	7
23	3
24	7
25	7
26	18
27	7
28	10
29	6
30	14
31	11
32	7
33	6
34	29
35	2
36	6
37	22
38	10
39	10
40	6
41	16
42	12
43	6
44	5
45	11
46	15
47	6
48	24
49	12
50	13
51	19
52	21
53	15
54	45
55	3
56	17
57	6
58	11
59	24
60	15
61	9
62	9
63	6
64	28
65	3
66	7
67	7
68	26
69	10
70	55
71	14
72	21
73	24
74	8

n	a(n)
1	0
2	2
3	2
4	4
5	5
6	2
7	5
8	6
9	2
10	13
11	5
12	17
13	3
14	12
15	11
16	15
17	9
18	6
19	21
20	11
21	6
22	7
23	3
24	7
25	7
26	18
27	7
28	10
29	6
30	14
31	11
32	7
33	6
34	29
35	2
36	6
37	22
38	10
39	10
40	6
41	16
42	12
43	6
44	5
45	11
46	15
47	6
48	24
49	12
50	13
51	19
52	21
53	15
54	45
55	3
56	17
57	6
58	11
59	24
60	15
61	9
62	9
63	6
64	28
65	3
66	7
67	7
68	26
69	10
70	55
71	14
72	21
73	24
74	8

n	a(n)
1	0
2	2
3	2
4	4
5	5
6	2
7	5
8	6
9	2
10	13
11	5
12	17
13	3
14	12
15	11
16	15
17	9
18	6
19	21
20	11
21	6
22	7
23	3
24	7
25	7
26	18
27	7
28	10
29	6
30	14
31	11
32	7
33	6
34	29
35	2
36	6
37	22
38	10
39	10
40	6
41	16
42	12
43	6
44	5
45	11
46	15
47	6
48	24
49	12
50	13
51	19
52	21
53	15
54	45
55	3
56	17
57	6
58	11
59	24
60	15
61	9
62	9
63	6
64	28
65	3
66	7
67	7
68	26
69	10
70	55
71	14
72	21
73	24
74	8