A085428 - cp's OEIS frontend

A085428 Sum of the smallest and largest prime divisors of the n-th composite number.

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

[4, 5, 4, 6, 7, 5, 9, 8, 4, 5, 7, 10, 13, 5, 10, 15, 6, 9, 7, 4, 14, 19, 12, 5, 21, 16, 7, 9, 13, 8, 25, 5, 14, 7, 20, 15, 5, 16, 9, 22, 31, 7, 33, 10, 4, 18, 13, 19, 26, 9, 5, 39, 8, 21, 18, 15, 7, 6, 43, 9, 22, 45, 32, 13, 7, 20, 25, 34, 49, 24, 5, 9, 14, 7]

cp's OEIS Frontend

A085428 Sum of the smallest and largest prime divisors of the n-th composite number.

Table of values

List of values

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

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

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