A261450 - cp's OEIS frontend

A261450 Smallest k such that A011557(n)//k//rev is prime, where rev is the string of digits of A011557(n) reversed (retaining any leading zeros) and // denotes concatenation.

n	a(n)
0	0
1	3
2	3
3	3
4	5
5	8
6	29
7	5
8	8
9	15
10	3
11	21
12	8
13	3
14	21
15	3
16	8
17	18
18	20
19	92
20	110
21	51
22	102
23	6
24	57
25	23
26	5
27	114
28	8
29	32
30	41
31	6
32	236
33	6
34	39
35	60
36	110
37	62
38	36
39	17
40	53
41	21
42	161
43	41
44	159
45	57
46	137
47	42
48	83
49	114
50	126
51	80
52	30
53	36
54	278
55	107
56	425
57	111
58	68
59	68
60	95
61	29
62	8
63	53
64	426
65	48

[0, 3, 3, 3, 5, 8, 29, 5, 8, 15, 3, 21, 8, 3, 21, 3, 8, 18, 20, 92, 110, 51, 102, 6, 57, 23, 5, 114, 8, 32, 41, 6, 236, 6, 39, 60, 110, 62, 36, 17, 53, 21, 161, 41, 159, 57, 137, 42, 83, 114, 126, 80, 30, 36, 278, 107, 425, 111, 68, 68, 95, 29, 8, 53, 426, 48]

cp's OEIS Frontend

A261450 Smallest k such that A011557(n)//k//rev is prime, where rev is the string of digits of A011557(n) reversed (retaining any leading zeros) and // denotes concatenation.

Table of values

List of values

n	a(n)
0	0
1	3
2	3
3	3
4	5
5	8
6	29
7	5
8	8
9	15
10	3
11	21
12	8
13	3
14	21
15	3
16	8
17	18
18	20
19	92
20	110
21	51
22	102
23	6
24	57
25	23
26	5
27	114
28	8
29	32
30	41
31	6
32	236
33	6
34	39
35	60
36	110
37	62
38	36
39	17
40	53
41	21
42	161
43	41
44	159
45	57
46	137
47	42
48	83
49	114
50	126
51	80
52	30
53	36
54	278
55	107
56	425
57	111
58	68
59	68
60	95
61	29
62	8
63	53
64	426
65	48

n	a(n)
0	0
1	3
2	3
3	3
4	5
5	8
6	29
7	5
8	8
9	15
10	3
11	21
12	8
13	3
14	21
15	3
16	8
17	18
18	20
19	92
20	110
21	51
22	102
23	6
24	57
25	23
26	5
27	114
28	8
29	32
30	41
31	6
32	236
33	6
34	39
35	60
36	110
37	62
38	36
39	17
40	53
41	21
42	161
43	41
44	159
45	57
46	137
47	42
48	83
49	114
50	126
51	80
52	30
53	36
54	278
55	107
56	425
57	111
58	68
59	68
60	95
61	29
62	8
63	53
64	426
65	48

n	a(n)
0	0
1	3
2	3
3	3
4	5
5	8
6	29
7	5
8	8
9	15
10	3
11	21
12	8
13	3
14	21
15	3
16	8
17	18
18	20
19	92
20	110
21	51
22	102
23	6
24	57
25	23
26	5
27	114
28	8
29	32
30	41
31	6
32	236
33	6
34	39
35	60
36	110
37	62
38	36
39	17
40	53
41	21
42	161
43	41
44	159
45	57
46	137
47	42
48	83
49	114
50	126
51	80
52	30
53	36
54	278
55	107
56	425
57	111
58	68
59	68
60	95
61	29
62	8
63	53
64	426
65	48