A128428 - cp's OEIS frontend

A128428 Number of distinct prime factors of n^2+1.

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	1
7	2
8	2
9	2
10	1
11	2
12	2
13	3
14	1
15	2
16	1
17	3
18	2
19	2
20	1
21	3
22	2
23	3
24	1
25	2
26	1
27	3
28	2
29	2
30	2
31	3
32	2
33	3
34	2
35	2
36	1
37	3
38	2
39	2
40	1
41	2
42	2
43	3
44	2
45	2
46	2
47	4
48	2
49	2
50	2
51	2
52	2
53	3
54	1
55	3
56	1
57	3
58	2
59	2
60	2
61	2
62	2
63	3
64	2
65	2
66	1
67	3
68	2
69	2
70	2
71	2
72	3
73	4
74	1
75	3
76	2
77	3
78	2
79	2
80	2
81	3
82	2
83	4
84	1
85	2
86	2
87	3
88	2
89	3
90	1
91	3
92	2
93	3
94	1
95	2
96	2
97	3
98	3
99	3
100	2
101	2
102	2

[1, 1, 2, 1, 2, 1, 2, 2, 2, 1, 2, 2, 3, 1, 2, 1, 3, 2, 2, 1, 3, 2, 3, 1, 2, 1, 3, 2, 2, 2, 3, 2, 3, 2, 2, 1, 3, 2, 2, 1, 2, 2, 3, 2, 2, 2, 4, 2, 2, 2, 2, 2, 3, 1, 3, 1, 3, 2, 2, 2, 2, 2, 3, 2, 2, 1, 3, 2, 2, 2, 2, 3, 4, 1, 3, 2, 3, 2, 2, 2, 3, 2, 4, 1, 2, 2, 3, 2, 3, 1, 3, 2, 3, 1, 2, 2, 3, 3, 3, 2, 2, 2]

cp's OEIS Frontend

A128428 Number of distinct prime factors of n^2+1.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	1
7	2
8	2
9	2
10	1
11	2
12	2
13	3
14	1
15	2
16	1
17	3
18	2
19	2
20	1
21	3
22	2
23	3
24	1
25	2
26	1
27	3
28	2
29	2
30	2
31	3
32	2
33	3
34	2
35	2
36	1
37	3
38	2
39	2
40	1
41	2
42	2
43	3
44	2
45	2
46	2
47	4
48	2
49	2
50	2
51	2
52	2
53	3
54	1
55	3
56	1
57	3
58	2
59	2
60	2
61	2
62	2
63	3
64	2
65	2
66	1
67	3
68	2
69	2
70	2
71	2
72	3
73	4
74	1
75	3
76	2
77	3
78	2
79	2
80	2
81	3
82	2
83	4
84	1
85	2
86	2
87	3
88	2
89	3
90	1
91	3
92	2
93	3
94	1
95	2
96	2
97	3
98	3
99	3
100	2
101	2
102	2

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	1
7	2
8	2
9	2
10	1
11	2
12	2
13	3
14	1
15	2
16	1
17	3
18	2
19	2
20	1
21	3
22	2
23	3
24	1
25	2
26	1
27	3
28	2
29	2
30	2
31	3
32	2
33	3
34	2
35	2
36	1
37	3
38	2
39	2
40	1
41	2
42	2
43	3
44	2
45	2
46	2
47	4
48	2
49	2
50	2
51	2
52	2
53	3
54	1
55	3
56	1
57	3
58	2
59	2
60	2
61	2
62	2
63	3
64	2
65	2
66	1
67	3
68	2
69	2
70	2
71	2
72	3
73	4
74	1
75	3
76	2
77	3
78	2
79	2
80	2
81	3
82	2
83	4
84	1
85	2
86	2
87	3
88	2
89	3
90	1
91	3
92	2
93	3
94	1
95	2
96	2
97	3
98	3
99	3
100	2
101	2
102	2

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	1
7	2
8	2
9	2
10	1
11	2
12	2
13	3
14	1
15	2
16	1
17	3
18	2
19	2
20	1
21	3
22	2
23	3
24	1
25	2
26	1
27	3
28	2
29	2
30	2
31	3
32	2
33	3
34	2
35	2
36	1
37	3
38	2
39	2
40	1
41	2
42	2
43	3
44	2
45	2
46	2
47	4
48	2
49	2
50	2
51	2
52	2
53	3
54	1
55	3
56	1
57	3
58	2
59	2
60	2
61	2
62	2
63	3
64	2
65	2
66	1
67	3
68	2
69	2
70	2
71	2
72	3
73	4
74	1
75	3
76	2
77	3
78	2
79	2
80	2
81	3
82	2
83	4
84	1
85	2
86	2
87	3
88	2
89	3
90	1
91	3
92	2
93	3
94	1
95	2
96	2
97	3
98	3
99	3
100	2
101	2
102	2