A023395 - cp's OEIS frontend

A023395 Only Fermat number divisible by A023394(n) is 2^2^a(n) + 1.

n	a(n)
1	0
2	1
3	2
4	3
5	5
6	4
7	12
8	6
9	11
10	11
11	9
12	5
13	18
14	12
15	10
16	12
17	23
18	16
19	15
20	10
21	19
22	12
23	19
24	13
25	36
26	21
27	38
28	32
29	25
30	17
31	39
32	6
33	26
34	27
35	30
36	30
37	8
38	12
39	15
40	29
41	38
42	7
43	25
44	27
45	36
46	42
47	25
48	13
49	13
50	55

[0, 1, 2, 3, 5, 4, 12, 6, 11, 11, 9, 5, 18, 12, 10, 12, 23, 16, 15, 10, 19, 12, 19, 13, 36, 21, 38, 32, 25, 17, 39, 6, 26, 27, 30, 30, 8, 12, 15, 29, 38, 7, 25, 27, 36, 42, 25, 13, 13, 55]

cp's OEIS Frontend

A023395 Only Fermat number divisible by A023394(n) is 2^2^a(n) + 1.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	3
5	5
6	4
7	12
8	6
9	11
10	11
11	9
12	5
13	18
14	12
15	10
16	12
17	23
18	16
19	15
20	10
21	19
22	12
23	19
24	13
25	36
26	21
27	38
28	32
29	25
30	17
31	39
32	6
33	26
34	27
35	30
36	30
37	8
38	12
39	15
40	29
41	38
42	7
43	25
44	27
45	36
46	42
47	25
48	13
49	13
50	55

n	a(n)
1	0
2	1
3	2
4	3
5	5
6	4
7	12
8	6
9	11
10	11
11	9
12	5
13	18
14	12
15	10
16	12
17	23
18	16
19	15
20	10
21	19
22	12
23	19
24	13
25	36
26	21
27	38
28	32
29	25
30	17
31	39
32	6
33	26
34	27
35	30
36	30
37	8
38	12
39	15
40	29
41	38
42	7
43	25
44	27
45	36
46	42
47	25
48	13
49	13
50	55

n	a(n)
1	0
2	1
3	2
4	3
5	5
6	4
7	12
8	6
9	11
10	11
11	9
12	5
13	18
14	12
15	10
16	12
17	23
18	16
19	15
20	10
21	19
22	12
23	19
24	13
25	36
26	21
27	38
28	32
29	25
30	17
31	39
32	6
33	26
34	27
35	30
36	30
37	8
38	12
39	15
40	29
41	38
42	7
43	25
44	27
45	36
46	42
47	25
48	13
49	13
50	55