A304720 - cp's OEIS frontend

A304720 Number of nonnegative integers k such that n - (4^k - k) is positive and squarefree.

n	a(n)
1	0
2	1
3	1
4	2
5	1
6	2
7	1
8	2
9	1
10	1
11	1
12	1
13	1
14	2
15	2
16	3
17	2
18	2
19	1
20	3
21	1
22	2
23	1
24	3
25	2
26	1
27	2
28	1
29	2
30	1
31	2
32	2
33	2
34	2
35	2
36	3
37	2
38	2
39	1
40	3
41	1
42	2
43	2
44	3
45	2
46	1
47	2
48	2
49	2
50	1
51	1
52	2
53	1
54	2
55	1
56	3
57	1
58	2
59	1
60	3
61	2
62	3
63	2
64	2
65	2
66	2
67	3
68	3
69	2
70	2
71	3
72	4
73	2
74	3
75	3
76	3
77	1
78	2
79	2
80	4
81	2
82	2
83	3
84	3
85	2
86	2
87	3
88	3
89	1
90	3
91	2
92	4
93	1
94	3
95	2
96	4
97	2
98	3
99	2
100	3

[0, 1, 1, 2, 1, 2, 1, 2, 1, 1, 1, 1, 1, 2, 2, 3, 2, 2, 1, 3, 1, 2, 1, 3, 2, 1, 2, 1, 2, 1, 2, 2, 2, 2, 2, 3, 2, 2, 1, 3, 1, 2, 2, 3, 2, 1, 2, 2, 2, 1, 1, 2, 1, 2, 1, 3, 1, 2, 1, 3, 2, 3, 2, 2, 2, 2, 3, 3, 2, 2, 3, 4, 2, 3, 3, 3, 1, 2, 2, 4, 2, 2, 3, 3, 2, 2, 3, 3, 1, 3, 2, 4, 1, 3, 2, 4, 2, 3, 2, 3]

cp's OEIS Frontend

A304720 Number of nonnegative integers k such that n - (4^k - k) is positive and squarefree.

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	2
5	1
6	2
7	1
8	2
9	1
10	1
11	1
12	1
13	1
14	2
15	2
16	3
17	2
18	2
19	1
20	3
21	1
22	2
23	1
24	3
25	2
26	1
27	2
28	1
29	2
30	1
31	2
32	2
33	2
34	2
35	2
36	3
37	2
38	2
39	1
40	3
41	1
42	2
43	2
44	3
45	2
46	1
47	2
48	2
49	2
50	1
51	1
52	2
53	1
54	2
55	1
56	3
57	1
58	2
59	1
60	3
61	2
62	3
63	2
64	2
65	2
66	2
67	3
68	3
69	2
70	2
71	3
72	4
73	2
74	3
75	3
76	3
77	1
78	2
79	2
80	4
81	2
82	2
83	3
84	3
85	2
86	2
87	3
88	3
89	1
90	3
91	2
92	4
93	1
94	3
95	2
96	4
97	2
98	3
99	2
100	3

n	a(n)
1	0
2	1
3	1
4	2
5	1
6	2
7	1
8	2
9	1
10	1
11	1
12	1
13	1
14	2
15	2
16	3
17	2
18	2
19	1
20	3
21	1
22	2
23	1
24	3
25	2
26	1
27	2
28	1
29	2
30	1
31	2
32	2
33	2
34	2
35	2
36	3
37	2
38	2
39	1
40	3
41	1
42	2
43	2
44	3
45	2
46	1
47	2
48	2
49	2
50	1
51	1
52	2
53	1
54	2
55	1
56	3
57	1
58	2
59	1
60	3
61	2
62	3
63	2
64	2
65	2
66	2
67	3
68	3
69	2
70	2
71	3
72	4
73	2
74	3
75	3
76	3
77	1
78	2
79	2
80	4
81	2
82	2
83	3
84	3
85	2
86	2
87	3
88	3
89	1
90	3
91	2
92	4
93	1
94	3
95	2
96	4
97	2
98	3
99	2
100	3

n	a(n)
1	0
2	1
3	1
4	2
5	1
6	2
7	1
8	2
9	1
10	1
11	1
12	1
13	1
14	2
15	2
16	3
17	2
18	2
19	1
20	3
21	1
22	2
23	1
24	3
25	2
26	1
27	2
28	1
29	2
30	1
31	2
32	2
33	2
34	2
35	2
36	3
37	2
38	2
39	1
40	3
41	1
42	2
43	2
44	3
45	2
46	1
47	2
48	2
49	2
50	1
51	1
52	2
53	1
54	2
55	1
56	3
57	1
58	2
59	1
60	3
61	2
62	3
63	2
64	2
65	2
66	2
67	3
68	3
69	2
70	2
71	3
72	4
73	2
74	3
75	3
76	3
77	1
78	2
79	2
80	4
81	2
82	2
83	3
84	3
85	2
86	2
87	3
88	3
89	1
90	3
91	2
92	4
93	1
94	3
95	2
96	4
97	2
98	3
99	2
100	3