A180101 - cp's OEIS frontend

A180101 a(0)=0, a(1)=1; thereafter a(n) = largest prime factor of sum of all previous terms.

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

[0, 1, 1, 2, 2, 3, 3, 3, 5, 5, 5, 5, 7, 7, 7, 7, 7, 7, 11, 11, 11, 11, 11, 11, 13, 13, 13, 13, 13, 13, 17, 17, 17, 17, 17, 17, 19, 19, 19, 19, 19, 19, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 29, 29, 29, 29, 29, 29, 29, 29, 31, 31, 31, 31, 31, 31, 31, 31, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 41, 41, 41, 41]

cp's OEIS Frontend

A180101 a(0)=0, a(1)=1; thereafter a(n) = largest prime factor of sum of all previous terms.

Table of values

List of values

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

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

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