A134188 - cp's OEIS frontend

A134188 a(0)=1. a(n) = the sum of the terms of the sequence (from among terms a(0) through a(n-1)) which equal any "non-isolated divisors" of (2n). A divisor, k, of n is non-isolated if (k-1) or (k+1) also divides n.

n	a(n)
0	1
1	1
2	2
3	4
4	4
5	4
6	16
7	4
8	4
9	4
10	28
11	4
12	32
13	4
14	4
15	4
16	4
17	4
18	52
19	4
20	56
21	4
22	4
23	4
24	68
25	4
26	4
27	4
28	4
29	4
30	88
31	4
32	4
33	4
34	4
35	4
36	108
37	4
38	4
39	4
40	120
41	4
42	124
43	4
44	4
45	4
46	4
47	4
48	144
49	4
50	148
51	4
52	4
53	4
54	160
55	4
56	4
57	4
58	4
59	4
60	180
61	4
62	4
63	4
64	4
65	4
66	200
67	4
68	4
69	4
70	212
71	4
72	216
73	4
74	4
75	4
76	4
77	4
78	236
79	4
80	240
81	4
82	4
83	4
84	252
85	4
86	4
87	4

[1, 1, 2, 4, 4, 4, 16, 4, 4, 4, 28, 4, 32, 4, 4, 4, 4, 4, 52, 4, 56, 4, 4, 4, 68, 4, 4, 4, 4, 4, 88, 4, 4, 4, 4, 4, 108, 4, 4, 4, 120, 4, 124, 4, 4, 4, 4, 4, 144, 4, 148, 4, 4, 4, 160, 4, 4, 4, 4, 4, 180, 4, 4, 4, 4, 4, 200, 4, 4, 4, 212, 4, 216, 4, 4, 4, 4, 4, 236, 4, 240, 4, 4, 4, 252, 4, 4, 4]

cp's OEIS Frontend

A134188 a(0)=1. a(n) = the sum of the terms of the sequence (from among terms a(0) through a(n-1)) which equal any "non-isolated divisors" of (2n). A divisor, k, of n is non-isolated if (k-1) or (k+1) also divides n.

Table of values

List of values

n	a(n)
0	1
1	1
2	2
3	4
4	4
5	4
6	16
7	4
8	4
9	4
10	28
11	4
12	32
13	4
14	4
15	4
16	4
17	4
18	52
19	4
20	56
21	4
22	4
23	4
24	68
25	4
26	4
27	4
28	4
29	4
30	88
31	4
32	4
33	4
34	4
35	4
36	108
37	4
38	4
39	4
40	120
41	4
42	124
43	4
44	4
45	4
46	4
47	4
48	144
49	4
50	148
51	4
52	4
53	4
54	160
55	4
56	4
57	4
58	4
59	4
60	180
61	4
62	4
63	4
64	4
65	4
66	200
67	4
68	4
69	4
70	212
71	4
72	216
73	4
74	4
75	4
76	4
77	4
78	236
79	4
80	240
81	4
82	4
83	4
84	252
85	4
86	4
87	4

n	a(n)
0	1
1	1
2	2
3	4
4	4
5	4
6	16
7	4
8	4
9	4
10	28
11	4
12	32
13	4
14	4
15	4
16	4
17	4
18	52
19	4
20	56
21	4
22	4
23	4
24	68
25	4
26	4
27	4
28	4
29	4
30	88
31	4
32	4
33	4
34	4
35	4
36	108
37	4
38	4
39	4
40	120
41	4
42	124
43	4
44	4
45	4
46	4
47	4
48	144
49	4
50	148
51	4
52	4
53	4
54	160
55	4
56	4
57	4
58	4
59	4
60	180
61	4
62	4
63	4
64	4
65	4
66	200
67	4
68	4
69	4
70	212
71	4
72	216
73	4
74	4
75	4
76	4
77	4
78	236
79	4
80	240
81	4
82	4
83	4
84	252
85	4
86	4
87	4

n	a(n)
0	1
1	1
2	2
3	4
4	4
5	4
6	16
7	4
8	4
9	4
10	28
11	4
12	32
13	4
14	4
15	4
16	4
17	4
18	52
19	4
20	56
21	4
22	4
23	4
24	68
25	4
26	4
27	4
28	4
29	4
30	88
31	4
32	4
33	4
34	4
35	4
36	108
37	4
38	4
39	4
40	120
41	4
42	124
43	4
44	4
45	4
46	4
47	4
48	144
49	4
50	148
51	4
52	4
53	4
54	160
55	4
56	4
57	4
58	4
59	4
60	180
61	4
62	4
63	4
64	4
65	4
66	200
67	4
68	4
69	4
70	212
71	4
72	216
73	4
74	4
75	4
76	4
77	4
78	236
79	4
80	240
81	4
82	4
83	4
84	252
85	4
86	4
87	4