A215029 - cp's OEIS frontend

A215029 To get a(n), start with m=n, let p = largest prime < m, set m = m-p if m>0, or m=m+p if m <= 0; repeat until p=2 has been processed; set a(n) = m.

n	a(n)
0	0
1	1
2	2
3	1
4	-1
5	0
6	0
7	1
8	1
9	2
10	-1
11	0
12	0
13	1
14	1
15	2
16	-1
17	0
18	0
19	1
20	1
21	2
22	-1
23	0
24	0
25	1
26	0
27	1
28	0
29	1
30	1
31	2
32	0
33	1
34	0
35	1
36	0
37	1
38	-1
39	0
40	1
41	2
42	0
43	1
44	-1
45	0
46	1
47	2
48	0
49	1
50	0
51	1
52	0
53	1
54	-1
55	0
56	1
57	2
58	-1
59	0
60	0
61	1
62	1
63	2
64	-1
65	0
66	1
67	2
68	0
69	1
70	0
71	1
72	-1
73	0
74	0
75	1
76	0
77	1
78	0
79	1
80	1
81	2
82	-1
83	0
84	0
85	1
86	0
87	1
88	0
89	1
90	1
91	2
92	-1
93	0
94	1
95	2
96	-1
97	0
98	0
99	1
100	0
101	1
102	1
103	2
104	0
105	1
106	0
107	1
108	-1
109	0
110	0
111	1
112	0
113	1
114	1

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

cp's OEIS Frontend

A215029 To get a(n), start with m=n, let p = largest prime < m, set m = m-p if m>0, or m=m+p if m <= 0; repeat until p=2 has been processed; set a(n) = m.

Table of values

List of values

n	a(n)
0	0
1	1
2	2
3	1
4	-1
5	0
6	0
7	1
8	1
9	2
10	-1
11	0
12	0
13	1
14	1
15	2
16	-1
17	0
18	0
19	1
20	1
21	2
22	-1
23	0
24	0
25	1
26	0
27	1
28	0
29	1
30	1
31	2
32	0
33	1
34	0
35	1
36	0
37	1
38	-1
39	0
40	1
41	2
42	0
43	1
44	-1
45	0
46	1
47	2
48	0
49	1
50	0
51	1
52	0
53	1
54	-1
55	0
56	1
57	2
58	-1
59	0
60	0
61	1
62	1
63	2
64	-1
65	0
66	1
67	2
68	0
69	1
70	0
71	1
72	-1
73	0
74	0
75	1
76	0
77	1
78	0
79	1
80	1
81	2
82	-1
83	0
84	0
85	1
86	0
87	1
88	0
89	1
90	1
91	2
92	-1
93	0
94	1
95	2
96	-1
97	0
98	0
99	1
100	0
101	1
102	1
103	2
104	0
105	1
106	0
107	1
108	-1
109	0
110	0
111	1
112	0
113	1
114	1

n	a(n)
0	0
1	1
2	2
3	1
4	-1
5	0
6	0
7	1
8	1
9	2
10	-1
11	0
12	0
13	1
14	1
15	2
16	-1
17	0
18	0
19	1
20	1
21	2
22	-1
23	0
24	0
25	1
26	0
27	1
28	0
29	1
30	1
31	2
32	0
33	1
34	0
35	1
36	0
37	1
38	-1
39	0
40	1
41	2
42	0
43	1
44	-1
45	0
46	1
47	2
48	0
49	1
50	0
51	1
52	0
53	1
54	-1
55	0
56	1
57	2
58	-1
59	0
60	0
61	1
62	1
63	2
64	-1
65	0
66	1
67	2
68	0
69	1
70	0
71	1
72	-1
73	0
74	0
75	1
76	0
77	1
78	0
79	1
80	1
81	2
82	-1
83	0
84	0
85	1
86	0
87	1
88	0
89	1
90	1
91	2
92	-1
93	0
94	1
95	2
96	-1
97	0
98	0
99	1
100	0
101	1
102	1
103	2
104	0
105	1
106	0
107	1
108	-1
109	0
110	0
111	1
112	0
113	1
114	1

n	a(n)
0	0
1	1
2	2
3	1
4	-1
5	0
6	0
7	1
8	1
9	2
10	-1
11	0
12	0
13	1
14	1
15	2
16	-1
17	0
18	0
19	1
20	1
21	2
22	-1
23	0
24	0
25	1
26	0
27	1
28	0
29	1
30	1
31	2
32	0
33	1
34	0
35	1
36	0
37	1
38	-1
39	0
40	1
41	2
42	0
43	1
44	-1
45	0
46	1
47	2
48	0
49	1
50	0
51	1
52	0
53	1
54	-1
55	0
56	1
57	2
58	-1
59	0
60	0
61	1
62	1
63	2
64	-1
65	0
66	1
67	2
68	0
69	1
70	0
71	1
72	-1
73	0
74	0
75	1
76	0
77	1
78	0
79	1
80	1
81	2
82	-1
83	0
84	0
85	1
86	0
87	1
88	0
89	1
90	1
91	2
92	-1
93	0
94	1
95	2
96	-1
97	0
98	0
99	1
100	0
101	1
102	1
103	2
104	0
105	1
106	0
107	1
108	-1
109	0
110	0
111	1
112	0
113	1
114	1