A365424 - cp's OEIS frontend

A365424 a(1) = 1, a(3^k) = 3 for k >= 1, and for any other n, a(n) is the last prime that is selected when the value of A356867(n) is computed with a greedy algorithm.

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

[1, 2, 3, 5, 2, 2, 2, 2, 3, 7, 7, 5, 5, 5, 2, 5, 2, 2, 5, 2, 2, 5, 2, 2, 2, 2, 3, 11, 11, 7, 11, 11, 7, 7, 7, 5, 7, 7, 5, 7, 7, 5, 5, 5, 2, 7, 7, 5, 5, 5, 2, 5, 2, 2, 7, 5, 5, 5, 2, 2, 5, 2, 2, 7, 5, 5, 5, 2, 2, 5, 2, 2, 5, 2, 2, 5, 2, 2, 2, 2, 3, 13, 13, 11, 13, 13, 11, 13, 13, 7, 13, 11, 11, 13, 11, 11, 11, 11, 7]

cp's OEIS Frontend

A365424 a(1) = 1, a(3^k) = 3 for k >= 1, and for any other n, a(n) is the last prime that is selected when the value of A356867(n) is computed with a greedy algorithm.

Table of values

List of values

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

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

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