A018845 - cp's OEIS frontend

A018845 Number of iterations required for the sum of n and its prime divisors = t to reach a prime (where t replaces n in each iteration) in A016837.

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

[4, 2, 3, 2, 1, 2, 2, 2, 1, 3, 1, 2, 1, 1, 3, 2, 2, 2, 1, 1, 2, 2, 2, 2, 1, 3, 3, 2, 3, 5, 4, 1, 1, 1, 2, 2, 1, 2, 2, 10, 3, 2, 1, 6, 1, 3, 1, 5, 5, 1, 5, 3, 2, 1, 5, 1, 1, 2, 7, 3, 4, 4, 4, 1, 10, 3, 1, 4, 6, 3, 6, 3, 1, 6, 3, 4, 2, 2, 2, 2, 9, 2, 5, 1, 1, 3]

cp's OEIS Frontend

A018845 Number of iterations required for the sum of n and its prime divisors = t to reach a prime (where t replaces n in each iteration) in A016837.

Table of values

List of values

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

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

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