A326047 - cp's OEIS frontend

A326047 a(n) = gcd(n-A050449(n), n-A050452(n)), where A050449 and A050452 give the sum of divisors of the form 4k+1 and of the form 4k+3, respectively.

n	a(n)
1	1
2	1
3	2
4	1
5	1
6	1
7	6
8	1
9	1
10	2
11	10
12	1
13	1
14	1
15	3
16	1
17	1
18	1
19	18
20	2
21	1
22	1
23	22
24	1
25	1
26	2
27	1
28	3
29	1
30	12
31	30
32	1
33	1
34	2
35	1
36	1
37	1
38	1
39	1
40	2
41	1
42	4
43	42
44	1
45	3
46	1
47	46
48	1
49	1
50	1
51	3
52	2
53	1
54	4
55	1
56	1
57	1
58	2
59	58
60	6
61	1
62	1
63	2
64	1
65	1
66	4
67	66
68	2
69	1
70	4
71	70
72	1
73	1
74	2
75	2
76	3
77	1
78	4
79	78
80	2
81	1
82	2
83	82
84	2
85	1
86	1
87	3
88	1
89	1
90	6
91	7
92	1
93	1
94	1
95	1
96	1
97	1
98	1
99	14
100	1
101	1
102	12
103	102
104	2
105	9

[1, 1, 2, 1, 1, 1, 6, 1, 1, 2, 10, 1, 1, 1, 3, 1, 1, 1, 18, 2, 1, 1, 22, 1, 1, 2, 1, 3, 1, 12, 30, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 4, 42, 1, 3, 1, 46, 1, 1, 1, 3, 2, 1, 4, 1, 1, 1, 2, 58, 6, 1, 1, 2, 1, 1, 4, 66, 2, 1, 4, 70, 1, 1, 2, 2, 3, 1, 4, 78, 2, 1, 2, 82, 2, 1, 1, 3, 1, 1, 6, 7, 1, 1, 1, 1, 1, 1, 1, 14, 1, 1, 12, 102, 2, 9]

cp's OEIS Frontend

A326047 a(n) = gcd(n-A050449(n), n-A050452(n)), where A050449 and A050452 give the sum of divisors of the form 4k+1 and of the form 4k+3, respectively.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	1
5	1
6	1
7	6
8	1
9	1
10	2
11	10
12	1
13	1
14	1
15	3
16	1
17	1
18	1
19	18
20	2
21	1
22	1
23	22
24	1
25	1
26	2
27	1
28	3
29	1
30	12
31	30
32	1
33	1
34	2
35	1
36	1
37	1
38	1
39	1
40	2
41	1
42	4
43	42
44	1
45	3
46	1
47	46
48	1
49	1
50	1
51	3
52	2
53	1
54	4
55	1
56	1
57	1
58	2
59	58
60	6
61	1
62	1
63	2
64	1
65	1
66	4
67	66
68	2
69	1
70	4
71	70
72	1
73	1
74	2
75	2
76	3
77	1
78	4
79	78
80	2
81	1
82	2
83	82
84	2
85	1
86	1
87	3
88	1
89	1
90	6
91	7
92	1
93	1
94	1
95	1
96	1
97	1
98	1
99	14
100	1
101	1
102	12
103	102
104	2
105	9

n	a(n)
1	1
2	1
3	2
4	1
5	1
6	1
7	6
8	1
9	1
10	2
11	10
12	1
13	1
14	1
15	3
16	1
17	1
18	1
19	18
20	2
21	1
22	1
23	22
24	1
25	1
26	2
27	1
28	3
29	1
30	12
31	30
32	1
33	1
34	2
35	1
36	1
37	1
38	1
39	1
40	2
41	1
42	4
43	42
44	1
45	3
46	1
47	46
48	1
49	1
50	1
51	3
52	2
53	1
54	4
55	1
56	1
57	1
58	2
59	58
60	6
61	1
62	1
63	2
64	1
65	1
66	4
67	66
68	2
69	1
70	4
71	70
72	1
73	1
74	2
75	2
76	3
77	1
78	4
79	78
80	2
81	1
82	2
83	82
84	2
85	1
86	1
87	3
88	1
89	1
90	6
91	7
92	1
93	1
94	1
95	1
96	1
97	1
98	1
99	14
100	1
101	1
102	12
103	102
104	2
105	9

n	a(n)
1	1
2	1
3	2
4	1
5	1
6	1
7	6
8	1
9	1
10	2
11	10
12	1
13	1
14	1
15	3
16	1
17	1
18	1
19	18
20	2
21	1
22	1
23	22
24	1
25	1
26	2
27	1
28	3
29	1
30	12
31	30
32	1
33	1
34	2
35	1
36	1
37	1
38	1
39	1
40	2
41	1
42	4
43	42
44	1
45	3
46	1
47	46
48	1
49	1
50	1
51	3
52	2
53	1
54	4
55	1
56	1
57	1
58	2
59	58
60	6
61	1
62	1
63	2
64	1
65	1
66	4
67	66
68	2
69	1
70	4
71	70
72	1
73	1
74	2
75	2
76	3
77	1
78	4
79	78
80	2
81	1
82	2
83	82
84	2
85	1
86	1
87	3
88	1
89	1
90	6
91	7
92	1
93	1
94	1
95	1
96	1
97	1
98	1
99	14
100	1
101	1
102	12
103	102
104	2
105	9