A362138 - cp's OEIS frontend

A362138 a(n) = gpf(a(n-1) + prime(n)) where gpf is the greatest prime factor and a(1)=2.

n	a(n)
1	2
2	5
3	5
4	3
5	7
6	5
7	11
8	5
9	7
10	3
11	17
12	3
13	11
14	3
15	5
16	29
17	11
18	3
19	7
20	13
21	43
22	61
23	3
24	23
25	5
26	53
27	13
28	5
29	19
30	11
31	23
32	11
33	37
34	11
35	5
36	13
37	17
38	5
39	43
40	3
41	13
42	97
43	3
44	7
45	17
46	3
47	107
48	11
49	17
50	41
51	137
52	47
53	3
54	127
55	3
56	19
57	3
58	137
59	23
60	19
61	151
62	37
63	43
64	59
65	31
66	29
67	5
68	19
69	61
70	41
71	197

[2, 5, 5, 3, 7, 5, 11, 5, 7, 3, 17, 3, 11, 3, 5, 29, 11, 3, 7, 13, 43, 61, 3, 23, 5, 53, 13, 5, 19, 11, 23, 11, 37, 11, 5, 13, 17, 5, 43, 3, 13, 97, 3, 7, 17, 3, 107, 11, 17, 41, 137, 47, 3, 127, 3, 19, 3, 137, 23, 19, 151, 37, 43, 59, 31, 29, 5, 19, 61, 41, 197]

cp's OEIS Frontend

A362138 a(n) = gpf(a(n-1) + prime(n)) where gpf is the greatest prime factor and a(1)=2.

Table of values

List of values

n	a(n)
1	2
2	5
3	5
4	3
5	7
6	5
7	11
8	5
9	7
10	3
11	17
12	3
13	11
14	3
15	5
16	29
17	11
18	3
19	7
20	13
21	43
22	61
23	3
24	23
25	5
26	53
27	13
28	5
29	19
30	11
31	23
32	11
33	37
34	11
35	5
36	13
37	17
38	5
39	43
40	3
41	13
42	97
43	3
44	7
45	17
46	3
47	107
48	11
49	17
50	41
51	137
52	47
53	3
54	127
55	3
56	19
57	3
58	137
59	23
60	19
61	151
62	37
63	43
64	59
65	31
66	29
67	5
68	19
69	61
70	41
71	197

n	a(n)
1	2
2	5
3	5
4	3
5	7
6	5
7	11
8	5
9	7
10	3
11	17
12	3
13	11
14	3
15	5
16	29
17	11
18	3
19	7
20	13
21	43
22	61
23	3
24	23
25	5
26	53
27	13
28	5
29	19
30	11
31	23
32	11
33	37
34	11
35	5
36	13
37	17
38	5
39	43
40	3
41	13
42	97
43	3
44	7
45	17
46	3
47	107
48	11
49	17
50	41
51	137
52	47
53	3
54	127
55	3
56	19
57	3
58	137
59	23
60	19
61	151
62	37
63	43
64	59
65	31
66	29
67	5
68	19
69	61
70	41
71	197

n	a(n)
1	2
2	5
3	5
4	3
5	7
6	5
7	11
8	5
9	7
10	3
11	17
12	3
13	11
14	3
15	5
16	29
17	11
18	3
19	7
20	13
21	43
22	61
23	3
24	23
25	5
26	53
27	13
28	5
29	19
30	11
31	23
32	11
33	37
34	11
35	5
36	13
37	17
38	5
39	43
40	3
41	13
42	97
43	3
44	7
45	17
46	3
47	107
48	11
49	17
50	41
51	137
52	47
53	3
54	127
55	3
56	19
57	3
58	137
59	23
60	19
61	151
62	37
63	43
64	59
65	31
66	29
67	5
68	19
69	61
70	41
71	197