A285734 - cp's OEIS frontend

A285734 a(1) = 0, and for n > 1, a(n) = the largest squarefree number x such that x < n-x, and n-x is also squarefree.

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

[0, 1, 1, 2, 2, 3, 2, 3, 3, 5, 5, 6, 6, 7, 5, 6, 7, 7, 6, 10, 10, 11, 10, 11, 11, 13, 13, 14, 14, 15, 14, 15, 14, 17, 14, 17, 15, 19, 17, 19, 19, 21, 21, 22, 22, 23, 21, 22, 23, 21, 22, 26, 23, 23, 26, 26, 26, 29, 29, 30, 30, 31, 30, 31, 31, 33, 33, 34, 34, 35, 34, 35, 35, 37, 37, 38, 38, 39, 38, 39, 39, 41, 41, 42, 42, 43, 41, 42, 43, 43, 38, 46, 46, 47, 42]

cp's OEIS Frontend

A285734 a(1) = 0, and for n > 1, a(n) = the largest squarefree number x such that x < n-x, and n-x is also squarefree.

Table of values

List of values

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

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

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