A216784 - cp's OEIS frontend

A216784 a(n) is the number of distinct prime divisors of n^2 + 1 of the form m^2 + 1.

n	a(n)
1	1
2	1
3	2
4	1
5	1
6	1
7	2
8	1
9	1
10	1
11	1
12	1
13	3
14	1
15	1
16	1
17	2
18	1
19	1
20	1
21	2
22	1
23	2
24	1
25	1
26	1
27	2
28	1
29	1
30	1
31	2
32	1
33	2
34	0
35	1
36	1
37	2
38	2
39	1
40	1
41	1
42	1
43	3
44	0
45	1
46	0
47	3
48	1
49	1
50	0
51	1
52	1
53	2
54	1
55	2
56	1
57	2
58	1
59	1
60	0
61	1
62	1
63	2
64	1
65	1
66	1
67	2
68	2
69	1
70	0
71	1
72	2
73	2
74	1
75	1
76	0
77	2
78	1
79	1
80	1
81	2
82	1
83	2
84	1
85	1
86	0
87	2

[1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 1, 3, 1, 1, 1, 2, 1, 1, 1, 2, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 2, 0, 1, 1, 2, 2, 1, 1, 1, 1, 3, 0, 1, 0, 3, 1, 1, 0, 1, 1, 2, 1, 2, 1, 2, 1, 1, 0, 1, 1, 2, 1, 1, 1, 2, 2, 1, 0, 1, 2, 2, 1, 1, 0, 2, 1, 1, 1, 2, 1, 2, 1, 1, 0, 2]

cp's OEIS Frontend

A216784 a(n) is the number of distinct prime divisors of n^2 + 1 of the form m^2 + 1.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	1
5	1
6	1
7	2
8	1
9	1
10	1
11	1
12	1
13	3
14	1
15	1
16	1
17	2
18	1
19	1
20	1
21	2
22	1
23	2
24	1
25	1
26	1
27	2
28	1
29	1
30	1
31	2
32	1
33	2
34	0
35	1
36	1
37	2
38	2
39	1
40	1
41	1
42	1
43	3
44	0
45	1
46	0
47	3
48	1
49	1
50	0
51	1
52	1
53	2
54	1
55	2
56	1
57	2
58	1
59	1
60	0
61	1
62	1
63	2
64	1
65	1
66	1
67	2
68	2
69	1
70	0
71	1
72	2
73	2
74	1
75	1
76	0
77	2
78	1
79	1
80	1
81	2
82	1
83	2
84	1
85	1
86	0
87	2

n	a(n)
1	1
2	1
3	2
4	1
5	1
6	1
7	2
8	1
9	1
10	1
11	1
12	1
13	3
14	1
15	1
16	1
17	2
18	1
19	1
20	1
21	2
22	1
23	2
24	1
25	1
26	1
27	2
28	1
29	1
30	1
31	2
32	1
33	2
34	0
35	1
36	1
37	2
38	2
39	1
40	1
41	1
42	1
43	3
44	0
45	1
46	0
47	3
48	1
49	1
50	0
51	1
52	1
53	2
54	1
55	2
56	1
57	2
58	1
59	1
60	0
61	1
62	1
63	2
64	1
65	1
66	1
67	2
68	2
69	1
70	0
71	1
72	2
73	2
74	1
75	1
76	0
77	2
78	1
79	1
80	1
81	2
82	1
83	2
84	1
85	1
86	0
87	2

n	a(n)
1	1
2	1
3	2
4	1
5	1
6	1
7	2
8	1
9	1
10	1
11	1
12	1
13	3
14	1
15	1
16	1
17	2
18	1
19	1
20	1
21	2
22	1
23	2
24	1
25	1
26	1
27	2
28	1
29	1
30	1
31	2
32	1
33	2
34	0
35	1
36	1
37	2
38	2
39	1
40	1
41	1
42	1
43	3
44	0
45	1
46	0
47	3
48	1
49	1
50	0
51	1
52	1
53	2
54	1
55	2
56	1
57	2
58	1
59	1
60	0
61	1
62	1
63	2
64	1
65	1
66	1
67	2
68	2
69	1
70	0
71	1
72	2
73	2
74	1
75	1
76	0
77	2
78	1
79	1
80	1
81	2
82	1
83	2
84	1
85	1
86	0
87	2