A081390 - cp's OEIS frontend

A081390 Number k such that the k-th Catalan number has only one non-unitary prime divisor; all the other prime divisors have exponent one.

n	a(n)
1	6
2	10
3	12
4	15
5	16
6	20
7	21
8	22
9	27
10	28
11	29
12	30
13	32
14	33
15	34
16	36
17	37
18	39
19	53
20	54
21	55
22	56
23	57
24	58
25	65
26	67
27	79
28	80
29	109
30	110
31	129
32	135
33	159
34	161
35	170
36	171
37	255
38	783
39	784
40	785
41	786
42	902

[6, 10, 12, 15, 16, 20, 21, 22, 27, 28, 29, 30, 32, 33, 34, 36, 37, 39, 53, 54, 55, 56, 57, 58, 65, 67, 79, 80, 109, 110, 129, 135, 159, 161, 170, 171, 255, 783, 784, 785, 786, 902]

cp's OEIS Frontend

A081390 Number k such that the k-th Catalan number has only one non-unitary prime divisor; all the other prime divisors have exponent one.

Table of values

List of values

n	a(n)
1	6
2	10
3	12
4	15
5	16
6	20
7	21
8	22
9	27
10	28
11	29
12	30
13	32
14	33
15	34
16	36
17	37
18	39
19	53
20	54
21	55
22	56
23	57
24	58
25	65
26	67
27	79
28	80
29	109
30	110
31	129
32	135
33	159
34	161
35	170
36	171
37	255
38	783
39	784
40	785
41	786
42	902

n	a(n)
1	6
2	10
3	12
4	15
5	16
6	20
7	21
8	22
9	27
10	28
11	29
12	30
13	32
14	33
15	34
16	36
17	37
18	39
19	53
20	54
21	55
22	56
23	57
24	58
25	65
26	67
27	79
28	80
29	109
30	110
31	129
32	135
33	159
34	161
35	170
36	171
37	255
38	783
39	784
40	785
41	786
42	902

n	a(n)
1	6
2	10
3	12
4	15
5	16
6	20
7	21
8	22
9	27
10	28
11	29
12	30
13	32
14	33
15	34
16	36
17	37
18	39
19	53
20	54
21	55
22	56
23	57
24	58
25	65
26	67
27	79
28	80
29	109
30	110
31	129
32	135
33	159
34	161
35	170
36	171
37	255
38	783
39	784
40	785
41	786
42	902