A381032 - cp's OEIS frontend

A381032 The radix prime of the least significant digit > 1 in the primorial base expansion of n, or 1 if there is no such digit.

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	3
6	1
7	1
8	1
9	1
10	3
11	3
12	5
13	5
14	5
15	5
16	3
17	3
18	5
19	5
20	5
21	5
22	3
23	3
24	5
25	5
26	5
27	5
28	3
29	3
30	1
31	1
32	1
33	1
34	3
35	3
36	1
37	1
38	1
39	1
40	3
41	3
42	5
43	5
44	5
45	5
46	3
47	3
48	5
49	5
50	5
51	5
52	3
53	3
54	5
55	5
56	5
57	5
58	3
59	3
60	7
61	7
62	7
63	7
64	3
65	3
66	7
67	7
68	7
69	7
70	3
71	3
72	5
73	5
74	5
75	5
76	3
77	3
78	5
79	5
80	5
81	5
82	3
83	3
84	5
85	5
86	5
87	5
88	3
89	3
90	7
91	7
92	7
93	7
94	3
95	3
96	7
97	7
98	7
99	7
100	3
101	3
102	5
103	5
104	5
105	5
106	3
107	3
108	5

[1, 1, 1, 1, 3, 3, 1, 1, 1, 1, 3, 3, 5, 5, 5, 5, 3, 3, 5, 5, 5, 5, 3, 3, 5, 5, 5, 5, 3, 3, 1, 1, 1, 1, 3, 3, 1, 1, 1, 1, 3, 3, 5, 5, 5, 5, 3, 3, 5, 5, 5, 5, 3, 3, 5, 5, 5, 5, 3, 3, 7, 7, 7, 7, 3, 3, 7, 7, 7, 7, 3, 3, 5, 5, 5, 5, 3, 3, 5, 5, 5, 5, 3, 3, 5, 5, 5, 5, 3, 3, 7, 7, 7, 7, 3, 3, 7, 7, 7, 7, 3, 3, 5, 5, 5, 5, 3, 3, 5]

cp's OEIS Frontend

A381032 The radix prime of the least significant digit > 1 in the primorial base expansion of n, or 1 if there is no such digit.

Table of values

List of values

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	3
6	1
7	1
8	1
9	1
10	3
11	3
12	5
13	5
14	5
15	5
16	3
17	3
18	5
19	5
20	5
21	5
22	3
23	3
24	5
25	5
26	5
27	5
28	3
29	3
30	1
31	1
32	1
33	1
34	3
35	3
36	1
37	1
38	1
39	1
40	3
41	3
42	5
43	5
44	5
45	5
46	3
47	3
48	5
49	5
50	5
51	5
52	3
53	3
54	5
55	5
56	5
57	5
58	3
59	3
60	7
61	7
62	7
63	7
64	3
65	3
66	7
67	7
68	7
69	7
70	3
71	3
72	5
73	5
74	5
75	5
76	3
77	3
78	5
79	5
80	5
81	5
82	3
83	3
84	5
85	5
86	5
87	5
88	3
89	3
90	7
91	7
92	7
93	7
94	3
95	3
96	7
97	7
98	7
99	7
100	3
101	3
102	5
103	5
104	5
105	5
106	3
107	3
108	5

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	3
6	1
7	1
8	1
9	1
10	3
11	3
12	5
13	5
14	5
15	5
16	3
17	3
18	5
19	5
20	5
21	5
22	3
23	3
24	5
25	5
26	5
27	5
28	3
29	3
30	1
31	1
32	1
33	1
34	3
35	3
36	1
37	1
38	1
39	1
40	3
41	3
42	5
43	5
44	5
45	5
46	3
47	3
48	5
49	5
50	5
51	5
52	3
53	3
54	5
55	5
56	5
57	5
58	3
59	3
60	7
61	7
62	7
63	7
64	3
65	3
66	7
67	7
68	7
69	7
70	3
71	3
72	5
73	5
74	5
75	5
76	3
77	3
78	5
79	5
80	5
81	5
82	3
83	3
84	5
85	5
86	5
87	5
88	3
89	3
90	7
91	7
92	7
93	7
94	3
95	3
96	7
97	7
98	7
99	7
100	3
101	3
102	5
103	5
104	5
105	5
106	3
107	3
108	5

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	3
6	1
7	1
8	1
9	1
10	3
11	3
12	5
13	5
14	5
15	5
16	3
17	3
18	5
19	5
20	5
21	5
22	3
23	3
24	5
25	5
26	5
27	5
28	3
29	3
30	1
31	1
32	1
33	1
34	3
35	3
36	1
37	1
38	1
39	1
40	3
41	3
42	5
43	5
44	5
45	5
46	3
47	3
48	5
49	5
50	5
51	5
52	3
53	3
54	5
55	5
56	5
57	5
58	3
59	3
60	7
61	7
62	7
63	7
64	3
65	3
66	7
67	7
68	7
69	7
70	3
71	3
72	5
73	5
74	5
75	5
76	3
77	3
78	5
79	5
80	5
81	5
82	3
83	3
84	5
85	5
86	5
87	5
88	3
89	3
90	7
91	7
92	7
93	7
94	3
95	3
96	7
97	7
98	7
99	7
100	3
101	3
102	5
103	5
104	5
105	5
106	3
107	3
108	5