A090735 - cp's OEIS frontend

A090735 Number of positive squarefree numbers <= n that can be expressed as a sum of 2 squares > 0.

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

[0, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 7, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, 15, 16, 16, 16, 16, 16, 16, 16, 16, 17, 17]

cp's OEIS Frontend

A090735 Number of positive squarefree numbers <= n that can be expressed as a sum of 2 squares > 0.

Table of values

List of values

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

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

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