A204030 - cp's OEIS frontend

A204030 Symmetric matrix based on f(i,j) = gcd(i+1, j+1), by antidiagonals.

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

[2, 1, 1, 2, 3, 2, 1, 1, 1, 1, 2, 1, 4, 1, 2, 1, 3, 1, 1, 3, 1, 2, 1, 2, 5, 2, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2, 3, 4, 1, 6, 1, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 2, 7, 2, 1, 2, 1, 2, 1, 3, 1, 5, 3, 1, 1, 3, 5, 1, 3, 1, 2, 1, 4, 1, 2, 1, 8, 1, 2, 1, 4, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1]

cp's OEIS Frontend

A204030 Symmetric matrix based on f(i,j) = gcd(i+1, j+1), by antidiagonals.

Table of values

List of values

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

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

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