A176590 - cp's OEIS frontend

A176590 Numbers k such that both concatenation of divisors of k and reverse concatenation of divisors of k are nonprime.

n	a(n)
1	1
2	2
3	5
4	6
5	8
6	10
7	11
8	12
9	14
10	15
11	16
12	17
13	18
14	20
15	22
16	23
17	24
18	26
19	27
20	28
21	29
22	30
23	32
24	33
25	34
26	35
27	36
28	38
29	40
30	41
31	42
32	44
33	45
34	46
35	47
36	49
37	50
38	51
39	52
40	53
41	54
42	55
43	56
44	57
45	58
46	59
47	60
48	61
49	62
50	63
51	64
52	65
53	66
54	68
55	69
56	70
57	71
58	72
59	74
60	75
61	76
62	77
63	78
64	80
65	81
66	82
67	83
68	84
69	85
70	86
71	87
72	88

[1, 2, 5, 6, 8, 10, 11, 12, 14, 15, 16, 17, 18, 20, 22, 23, 24, 26, 27, 28, 29, 30, 32, 33, 34, 35, 36, 38, 40, 41, 42, 44, 45, 46, 47, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 68, 69, 70, 71, 72, 74, 75, 76, 77, 78, 80, 81, 82, 83, 84, 85, 86, 87, 88]

cp's OEIS Frontend

A176590 Numbers k such that both concatenation of divisors of k and reverse concatenation of divisors of k are nonprime.

Table of values

List of values

n	a(n)
1	1
2	2
3	5
4	6
5	8
6	10
7	11
8	12
9	14
10	15
11	16
12	17
13	18
14	20
15	22
16	23
17	24
18	26
19	27
20	28
21	29
22	30
23	32
24	33
25	34
26	35
27	36
28	38
29	40
30	41
31	42
32	44
33	45
34	46
35	47
36	49
37	50
38	51
39	52
40	53
41	54
42	55
43	56
44	57
45	58
46	59
47	60
48	61
49	62
50	63
51	64
52	65
53	66
54	68
55	69
56	70
57	71
58	72
59	74
60	75
61	76
62	77
63	78
64	80
65	81
66	82
67	83
68	84
69	85
70	86
71	87
72	88

n	a(n)
1	1
2	2
3	5
4	6
5	8
6	10
7	11
8	12
9	14
10	15
11	16
12	17
13	18
14	20
15	22
16	23
17	24
18	26
19	27
20	28
21	29
22	30
23	32
24	33
25	34
26	35
27	36
28	38
29	40
30	41
31	42
32	44
33	45
34	46
35	47
36	49
37	50
38	51
39	52
40	53
41	54
42	55
43	56
44	57
45	58
46	59
47	60
48	61
49	62
50	63
51	64
52	65
53	66
54	68
55	69
56	70
57	71
58	72
59	74
60	75
61	76
62	77
63	78
64	80
65	81
66	82
67	83
68	84
69	85
70	86
71	87
72	88

n	a(n)
1	1
2	2
3	5
4	6
5	8
6	10
7	11
8	12
9	14
10	15
11	16
12	17
13	18
14	20
15	22
16	23
17	24
18	26
19	27
20	28
21	29
22	30
23	32
24	33
25	34
26	35
27	36
28	38
29	40
30	41
31	42
32	44
33	45
34	46
35	47
36	49
37	50
38	51
39	52
40	53
41	54
42	55
43	56
44	57
45	58
46	59
47	60
48	61
49	62
50	63
51	64
52	65
53	66
54	68
55	69
56	70
57	71
58	72
59	74
60	75
61	76
62	77
63	78
64	80
65	81
66	82
67	83
68	84
69	85
70	86
71	87
72	88