A251717 - cp's OEIS frontend

A251717 a(n) = smallest positive integer k such that A083221(k, n) has at most two prime factors (is a prime or semiprime).

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	2
7	1
8	3
9	2
10	2
11	1
12	2
13	1
14	3
15	2
16	2
17	1
18	3
19	1
20	3
21	2
22	2
23	1
24	2
25	3
26	4
27	2
28	3
29	1
30	2
31	1
32	5
33	3
34	2
35	3
36	2
37	1
38	3
39	6
40	2
41	1
42	2
43	1
44	3
45	2
46	3
47	1
48	4
49	2
50	3
51	2
52	2
53	1
54	2
55	2
56	3
57	2
58	3
59	1
60	3
61	1
62	4
63	4
64	2
65	3
66	2
67	1
68	5
69	2
70	2
71	1
72	4
73	1
74	4
75	2
76	2
77	3
78	3
79	1
80	3
81	3
82	2
83	1
84	2
85	4
86	3
87	2
88	3
89	1
90	2
91	2
92	5
93	3
94	3
95	3
96	2
97	1
98	3
99	2
100	2
101	1
102	4
103	1
104	3
105	3
106	2
107	1
108	5
109	1
110	4
111	3
112	2
113	1
114	2
115	2
116	3
117	2
118	3
119	4
120	2

[1, 1, 1, 2, 1, 2, 1, 3, 2, 2, 1, 2, 1, 3, 2, 2, 1, 3, 1, 3, 2, 2, 1, 2, 3, 4, 2, 3, 1, 2, 1, 5, 3, 2, 3, 2, 1, 3, 6, 2, 1, 2, 1, 3, 2, 3, 1, 4, 2, 3, 2, 2, 1, 2, 2, 3, 2, 3, 1, 3, 1, 4, 4, 2, 3, 2, 1, 5, 2, 2, 1, 4, 1, 4, 2, 2, 3, 3, 1, 3, 3, 2, 1, 2, 4, 3, 2, 3, 1, 2, 2, 5, 3, 3, 3, 2, 1, 3, 2, 2, 1, 4, 1, 3, 3, 2, 1, 5, 1, 4, 3, 2, 1, 2, 2, 3, 2, 3, 4, 2]

cp's OEIS Frontend

A251717 a(n) = smallest positive integer k such that A083221(k, n) has at most two prime factors (is a prime or semiprime).

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	2
7	1
8	3
9	2
10	2
11	1
12	2
13	1
14	3
15	2
16	2
17	1
18	3
19	1
20	3
21	2
22	2
23	1
24	2
25	3
26	4
27	2
28	3
29	1
30	2
31	1
32	5
33	3
34	2
35	3
36	2
37	1
38	3
39	6
40	2
41	1
42	2
43	1
44	3
45	2
46	3
47	1
48	4
49	2
50	3
51	2
52	2
53	1
54	2
55	2
56	3
57	2
58	3
59	1
60	3
61	1
62	4
63	4
64	2
65	3
66	2
67	1
68	5
69	2
70	2
71	1
72	4
73	1
74	4
75	2
76	2
77	3
78	3
79	1
80	3
81	3
82	2
83	1
84	2
85	4
86	3
87	2
88	3
89	1
90	2
91	2
92	5
93	3
94	3
95	3
96	2
97	1
98	3
99	2
100	2
101	1
102	4
103	1
104	3
105	3
106	2
107	1
108	5
109	1
110	4
111	3
112	2
113	1
114	2
115	2
116	3
117	2
118	3
119	4
120	2

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	2
7	1
8	3
9	2
10	2
11	1
12	2
13	1
14	3
15	2
16	2
17	1
18	3
19	1
20	3
21	2
22	2
23	1
24	2
25	3
26	4
27	2
28	3
29	1
30	2
31	1
32	5
33	3
34	2
35	3
36	2
37	1
38	3
39	6
40	2
41	1
42	2
43	1
44	3
45	2
46	3
47	1
48	4
49	2
50	3
51	2
52	2
53	1
54	2
55	2
56	3
57	2
58	3
59	1
60	3
61	1
62	4
63	4
64	2
65	3
66	2
67	1
68	5
69	2
70	2
71	1
72	4
73	1
74	4
75	2
76	2
77	3
78	3
79	1
80	3
81	3
82	2
83	1
84	2
85	4
86	3
87	2
88	3
89	1
90	2
91	2
92	5
93	3
94	3
95	3
96	2
97	1
98	3
99	2
100	2
101	1
102	4
103	1
104	3
105	3
106	2
107	1
108	5
109	1
110	4
111	3
112	2
113	1
114	2
115	2
116	3
117	2
118	3
119	4
120	2

n	a(n)
1	1
2	1
3	1
4	2
5	1
6	2
7	1
8	3
9	2
10	2
11	1
12	2
13	1
14	3
15	2
16	2
17	1
18	3
19	1
20	3
21	2
22	2
23	1
24	2
25	3
26	4
27	2
28	3
29	1
30	2
31	1
32	5
33	3
34	2
35	3
36	2
37	1
38	3
39	6
40	2
41	1
42	2
43	1
44	3
45	2
46	3
47	1
48	4
49	2
50	3
51	2
52	2
53	1
54	2
55	2
56	3
57	2
58	3
59	1
60	3
61	1
62	4
63	4
64	2
65	3
66	2
67	1
68	5
69	2
70	2
71	1
72	4
73	1
74	4
75	2
76	2
77	3
78	3
79	1
80	3
81	3
82	2
83	1
84	2
85	4
86	3
87	2
88	3
89	1
90	2
91	2
92	5
93	3
94	3
95	3
96	2
97	1
98	3
99	2
100	2
101	1
102	4
103	1
104	3
105	3
106	2
107	1
108	5
109	1
110	4
111	3
112	2
113	1
114	2
115	2
116	3
117	2
118	3
119	4
120	2