A121561 - cp's OEIS frontend

A121561 The number of iterations of "subtract the largest prime less than or equal to the current value" to go from n to the limiting value 0 or 1.

n	a(n)
1	0
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	2
10	2
11	1
12	1
13	1
14	1
15	2
16	2
17	1
18	1
19	1
20	1
21	2
22	2
23	1
24	1
25	2
26	2
27	2
28	2
29	1
30	1
31	1
32	1
33	2
34	2
35	2
36	2
37	1
38	1
39	2
40	2
41	1
42	1
43	1
44	1
45	2
46	2
47	1
48	1
49	2
50	2
51	2
52	2
53	1
54	1
55	2
56	2
57	2
58	2
59	1
60	1
61	1
62	1
63	2
64	2
65	2
66	2
67	1
68	1
69	2
70	2
71	1
72	1
73	1
74	1
75	2
76	2
77	2
78	2
79	1
80	1
81	2
82	2
83	1
84	1
85	2
86	2
87	2
88	2
89	1
90	1
91	2
92	2
93	2
94	2
95	2
96	2
97	1
98	1
99	2
100	2
101	1
102	1
103	1
104	1
105	2

[0, 1, 1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 1, 1, 2, 2, 2, 2, 1, 1, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 2, 2, 1, 1, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 2, 2, 2, 2, 1, 1, 2, 2, 1, 1, 1, 1, 2]

cp's OEIS Frontend

A121561 The number of iterations of "subtract the largest prime less than or equal to the current value" to go from n to the limiting value 0 or 1.

Table of values

List of values

n	a(n)
1	0
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	2
10	2
11	1
12	1
13	1
14	1
15	2
16	2
17	1
18	1
19	1
20	1
21	2
22	2
23	1
24	1
25	2
26	2
27	2
28	2
29	1
30	1
31	1
32	1
33	2
34	2
35	2
36	2
37	1
38	1
39	2
40	2
41	1
42	1
43	1
44	1
45	2
46	2
47	1
48	1
49	2
50	2
51	2
52	2
53	1
54	1
55	2
56	2
57	2
58	2
59	1
60	1
61	1
62	1
63	2
64	2
65	2
66	2
67	1
68	1
69	2
70	2
71	1
72	1
73	1
74	1
75	2
76	2
77	2
78	2
79	1
80	1
81	2
82	2
83	1
84	1
85	2
86	2
87	2
88	2
89	1
90	1
91	2
92	2
93	2
94	2
95	2
96	2
97	1
98	1
99	2
100	2
101	1
102	1
103	1
104	1
105	2

n	a(n)
1	0
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	2
10	2
11	1
12	1
13	1
14	1
15	2
16	2
17	1
18	1
19	1
20	1
21	2
22	2
23	1
24	1
25	2
26	2
27	2
28	2
29	1
30	1
31	1
32	1
33	2
34	2
35	2
36	2
37	1
38	1
39	2
40	2
41	1
42	1
43	1
44	1
45	2
46	2
47	1
48	1
49	2
50	2
51	2
52	2
53	1
54	1
55	2
56	2
57	2
58	2
59	1
60	1
61	1
62	1
63	2
64	2
65	2
66	2
67	1
68	1
69	2
70	2
71	1
72	1
73	1
74	1
75	2
76	2
77	2
78	2
79	1
80	1
81	2
82	2
83	1
84	1
85	2
86	2
87	2
88	2
89	1
90	1
91	2
92	2
93	2
94	2
95	2
96	2
97	1
98	1
99	2
100	2
101	1
102	1
103	1
104	1
105	2

n	a(n)
1	0
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	2
10	2
11	1
12	1
13	1
14	1
15	2
16	2
17	1
18	1
19	1
20	1
21	2
22	2
23	1
24	1
25	2
26	2
27	2
28	2
29	1
30	1
31	1
32	1
33	2
34	2
35	2
36	2
37	1
38	1
39	2
40	2
41	1
42	1
43	1
44	1
45	2
46	2
47	1
48	1
49	2
50	2
51	2
52	2
53	1
54	1
55	2
56	2
57	2
58	2
59	1
60	1
61	1
62	1
63	2
64	2
65	2
66	2
67	1
68	1
69	2
70	2
71	1
72	1
73	1
74	1
75	2
76	2
77	2
78	2
79	1
80	1
81	2
82	2
83	1
84	1
85	2
86	2
87	2
88	2
89	1
90	1
91	2
92	2
93	2
94	2
95	2
96	2
97	1
98	1
99	2
100	2
101	1
102	1
103	1
104	1
105	2