A076563 - cp's OEIS frontend

A076563 a(n) = n - greatest prime divisor of n, for n>1.

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

[0, 0, 2, 0, 3, 0, 6, 6, 5, 0, 9, 0, 7, 10, 14, 0, 15, 0, 15, 14, 11, 0, 21, 20, 13, 24, 21, 0, 25, 0, 30, 22, 17, 28, 33, 0, 19, 26, 35, 0, 35, 0, 33, 40, 23, 0, 45, 42, 45, 34, 39, 0, 51, 44, 49, 38, 29, 0, 55, 0, 31, 56, 62, 52, 55, 0, 51, 46, 63, 0, 69, 0, 37, 70, 57, 66, 65, 0, 75]

cp's OEIS Frontend

A076563 a(n) = n - greatest prime divisor of n, for n>1.

Table of values

List of values

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

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

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