A240501 - cp's OEIS frontend

A240501 Given circular disks of radius r in a hexagonal lattice covered by a circular disk of radius R = r*2n, if the center of the circle is chosen at the middle between two lattice points, a(n) is the number of points at which an r-circle is tangent to the R-circle.

n	a(n)
1	2
2	2
3	2
4	6
5	2
6	2
7	6
8	2
9	2
10	6
11	6
12	2
13	2
14	2
15	2
16	6
17	2
18	6
19	6
20	6
21	2
22	6
23	2
24	2
25	10
26	2
27	2
28	2
29	6
30	2
31	6
32	6
33	6
34	6
35	2
36	2
37	6
38	2
39	6
40	6
41	2
42	2
43	2
44	2
45	2
46	18
47	6
48	6
49	6
50	2
51	2
52	6
53	6
54	2
55	6
56	6
57	2
58	2
59	6
60	6
61	2
62	2
63	2
64	6
65	6
66	2
67	18
68	2
69	2
70	6
71	2
72	6
73	2
74	10
75	2
76	6
77	2
78	6
79	6
80	2
81	6
82	6
83	2
84	2
85	10
86	6
87	2
88	6
89	2
90	2
91	6
92	6
93	6
94	2
95	6
96	2
97	6
98	6
99	2
100	6
101	6
102	6
103	2
104	2
105	6
106	6
107	2
108	6
109	18
110	6
111	6
112	6
113	2
114	2
115	6
116	6
117	2
118	2
119	6
120	2
121	6
122	2
123	10
124	18
125	2
126	2
127	2
128	2
129	2
130	18
131	2
132	2
133	2
134	2
135	2
136	6
137	18
138	2
139	6
140	6
141	2
142	6
143	6
144	6

[2, 2, 2, 6, 2, 2, 6, 2, 2, 6, 6, 2, 2, 2, 2, 6, 2, 6, 6, 6, 2, 6, 2, 2, 10, 2, 2, 2, 6, 2, 6, 6, 6, 6, 2, 2, 6, 2, 6, 6, 2, 2, 2, 2, 2, 18, 6, 6, 6, 2, 2, 6, 6, 2, 6, 6, 2, 2, 6, 6, 2, 2, 2, 6, 6, 2, 18, 2, 2, 6, 2, 6, 2, 10, 2, 6, 2, 6, 6, 2, 6, 6, 2, 2, 10, 6, 2, 6, 2, 2, 6, 6, 6, 2, 6, 2, 6, 6, 2, 6, 6, 6, 2, 2, 6, 6, 2, 6, 18, 6, 6, 6, 2, 2, 6, 6, 2, 2, 6, 2, 6, 2, 10, 18, 2, 2, 2, 2, 2, 18, 2, 2, 2, 2, 2, 6, 18, 2, 6, 6, 2, 6, 6, 6]

cp's OEIS Frontend

A240501 Given circular disks of radius r in a hexagonal lattice covered by a circular disk of radius R = r*2n, if the center of the circle is chosen at the middle between two lattice points, a(n) is the number of points at which an r-circle is tangent to the R-circle.

Table of values

List of values

n	a(n)
1	2
2	2
3	2
4	6
5	2
6	2
7	6
8	2
9	2
10	6
11	6
12	2
13	2
14	2
15	2
16	6
17	2
18	6
19	6
20	6
21	2
22	6
23	2
24	2
25	10
26	2
27	2
28	2
29	6
30	2
31	6
32	6
33	6
34	6
35	2
36	2
37	6
38	2
39	6
40	6
41	2
42	2
43	2
44	2
45	2
46	18
47	6
48	6
49	6
50	2
51	2
52	6
53	6
54	2
55	6
56	6
57	2
58	2
59	6
60	6
61	2
62	2
63	2
64	6
65	6
66	2
67	18
68	2
69	2
70	6
71	2
72	6
73	2
74	10
75	2
76	6
77	2
78	6
79	6
80	2
81	6
82	6
83	2
84	2
85	10
86	6
87	2
88	6
89	2
90	2
91	6
92	6
93	6
94	2
95	6
96	2
97	6
98	6
99	2
100	6
101	6
102	6
103	2
104	2
105	6
106	6
107	2
108	6
109	18
110	6
111	6
112	6
113	2
114	2
115	6
116	6
117	2
118	2
119	6
120	2
121	6
122	2
123	10
124	18
125	2
126	2
127	2
128	2
129	2
130	18
131	2
132	2
133	2
134	2
135	2
136	6
137	18
138	2
139	6
140	6
141	2
142	6
143	6
144	6

n	a(n)
1	2
2	2
3	2
4	6
5	2
6	2
7	6
8	2
9	2
10	6
11	6
12	2
13	2
14	2
15	2
16	6
17	2
18	6
19	6
20	6
21	2
22	6
23	2
24	2
25	10
26	2
27	2
28	2
29	6
30	2
31	6
32	6
33	6
34	6
35	2
36	2
37	6
38	2
39	6
40	6
41	2
42	2
43	2
44	2
45	2
46	18
47	6
48	6
49	6
50	2
51	2
52	6
53	6
54	2
55	6
56	6
57	2
58	2
59	6
60	6
61	2
62	2
63	2
64	6
65	6
66	2
67	18
68	2
69	2
70	6
71	2
72	6
73	2
74	10
75	2
76	6
77	2
78	6
79	6
80	2
81	6
82	6
83	2
84	2
85	10
86	6
87	2
88	6
89	2
90	2
91	6
92	6
93	6
94	2
95	6
96	2
97	6
98	6
99	2
100	6
101	6
102	6
103	2
104	2
105	6
106	6
107	2
108	6
109	18
110	6
111	6
112	6
113	2
114	2
115	6
116	6
117	2
118	2
119	6
120	2
121	6
122	2
123	10
124	18
125	2
126	2
127	2
128	2
129	2
130	18
131	2
132	2
133	2
134	2
135	2
136	6
137	18
138	2
139	6
140	6
141	2
142	6
143	6
144	6

n	a(n)
1	2
2	2
3	2
4	6
5	2
6	2
7	6
8	2
9	2
10	6
11	6
12	2
13	2
14	2
15	2
16	6
17	2
18	6
19	6
20	6
21	2
22	6
23	2
24	2
25	10
26	2
27	2
28	2
29	6
30	2
31	6
32	6
33	6
34	6
35	2
36	2
37	6
38	2
39	6
40	6
41	2
42	2
43	2
44	2
45	2
46	18
47	6
48	6
49	6
50	2
51	2
52	6
53	6
54	2
55	6
56	6
57	2
58	2
59	6
60	6
61	2
62	2
63	2
64	6
65	6
66	2
67	18
68	2
69	2
70	6
71	2
72	6
73	2
74	10
75	2
76	6
77	2
78	6
79	6
80	2
81	6
82	6
83	2
84	2
85	10
86	6
87	2
88	6
89	2
90	2
91	6
92	6
93	6
94	2
95	6
96	2
97	6
98	6
99	2
100	6
101	6
102	6
103	2
104	2
105	6
106	6
107	2
108	6
109	18
110	6
111	6
112	6
113	2
114	2
115	6
116	6
117	2
118	2
119	6
120	2
121	6
122	2
123	10
124	18
125	2
126	2
127	2
128	2
129	2
130	18
131	2
132	2
133	2
134	2
135	2
136	6
137	18
138	2
139	6
140	6
141	2
142	6
143	6
144	6