A138510 - cp's OEIS frontend

A138510 Smallest number b such that in base b the prime factors of the n-th semiprime (A001358) have equal lengths.

n	a(n)
1	1
2	2
3	1
4	6
5	8
6	3
7	3
8	12
9	1
10	14
11	12
12	18
13	2
14	20
15	14
16	24
17	1
18	18
19	4
20	20
21	30
22	32
23	4
24	24
25	38
26	4
27	42
28	5
29	44
30	30
31	4
32	32
33	48
34	5
35	54
36	38
37	5
38	60
39	5
40	1
41	62
42	42
43	44
44	5
45	68
46	48
47	72
48	2
49	30
50	74
51	32
52	80
53	54
54	5
55	84
56	1
57	60
58	90
59	62
60	38
61	3
62	98
63	68
64	102
65	6
66	42
67	104
68	3
69	72
70	108
71	44
72	6
73	110
74	74
75	3
76	114
77	48
78	80

[1, 2, 1, 6, 8, 3, 3, 12, 1, 14, 12, 18, 2, 20, 14, 24, 1, 18, 4, 20, 30, 32, 4, 24, 38, 4, 42, 5, 44, 30, 4, 32, 48, 5, 54, 38, 5, 60, 5, 1, 62, 42, 44, 5, 68, 48, 72, 2, 30, 74, 32, 80, 54, 5, 84, 1, 60, 90, 62, 38, 3, 98, 68, 102, 6, 42, 104, 3, 72, 108, 44, 6, 110, 74, 3, 114, 48, 80]

cp's OEIS Frontend

A138510 Smallest number b such that in base b the prime factors of the n-th semiprime (A001358) have equal lengths.

Table of values

List of values

n	a(n)
1	1
2	2
3	1
4	6
5	8
6	3
7	3
8	12
9	1
10	14
11	12
12	18
13	2
14	20
15	14
16	24
17	1
18	18
19	4
20	20
21	30
22	32
23	4
24	24
25	38
26	4
27	42
28	5
29	44
30	30
31	4
32	32
33	48
34	5
35	54
36	38
37	5
38	60
39	5
40	1
41	62
42	42
43	44
44	5
45	68
46	48
47	72
48	2
49	30
50	74
51	32
52	80
53	54
54	5
55	84
56	1
57	60
58	90
59	62
60	38
61	3
62	98
63	68
64	102
65	6
66	42
67	104
68	3
69	72
70	108
71	44
72	6
73	110
74	74
75	3
76	114
77	48
78	80

n	a(n)
1	1
2	2
3	1
4	6
5	8
6	3
7	3
8	12
9	1
10	14
11	12
12	18
13	2
14	20
15	14
16	24
17	1
18	18
19	4
20	20
21	30
22	32
23	4
24	24
25	38
26	4
27	42
28	5
29	44
30	30
31	4
32	32
33	48
34	5
35	54
36	38
37	5
38	60
39	5
40	1
41	62
42	42
43	44
44	5
45	68
46	48
47	72
48	2
49	30
50	74
51	32
52	80
53	54
54	5
55	84
56	1
57	60
58	90
59	62
60	38
61	3
62	98
63	68
64	102
65	6
66	42
67	104
68	3
69	72
70	108
71	44
72	6
73	110
74	74
75	3
76	114
77	48
78	80

n	a(n)
1	1
2	2
3	1
4	6
5	8
6	3
7	3
8	12
9	1
10	14
11	12
12	18
13	2
14	20
15	14
16	24
17	1
18	18
19	4
20	20
21	30
22	32
23	4
24	24
25	38
26	4
27	42
28	5
29	44
30	30
31	4
32	32
33	48
34	5
35	54
36	38
37	5
38	60
39	5
40	1
41	62
42	42
43	44
44	5
45	68
46	48
47	72
48	2
49	30
50	74
51	32
52	80
53	54
54	5
55	84
56	1
57	60
58	90
59	62
60	38
61	3
62	98
63	68
64	102
65	6
66	42
67	104
68	3
69	72
70	108
71	44
72	6
73	110
74	74
75	3
76	114
77	48
78	80