A118306 - cp's OEIS frontend

A118306 If n = product{k>=1} p(k)^b(n,k), where p(k) is the k-th prime and where each b(n,k) is a nonnegative integer, then: If n occurs earlier in the sequence, then a(n) = product{k>=2} p(k-1)^b(n,k); If n does not occur earlier in the sequence, then a(n) = product{k>=1} p(k+1)^b(n,k).

n	a(n)
1	1
2	3
3	2
4	9
5	7
6	15
7	5
8	27
9	4
10	21
11	13
12	45
13	11
14	33
15	6
16	81
17	19
18	75
19	17
20	63
21	10
22	39
23	29
24	135
25	49
26	51
27	8
28	99
29	23
30	105
31	37
32	243
33	14
34	57
35	77
36	225
37	31
38	69
39	22
40	189
41	43
42	165
43	41
44	117
45	12
46	87
47	53
48	405
49	25
50	147
51	26
52	153
53	47
54	375
55	91
56	297
57	34
58	93
59	61
60	315
61	59
62	111
63	20
64	729
65	119
66	195
67	71

[1, 3, 2, 9, 7, 15, 5, 27, 4, 21, 13, 45, 11, 33, 6, 81, 19, 75, 17, 63, 10, 39, 29, 135, 49, 51, 8, 99, 23, 105, 37, 243, 14, 57, 77, 225, 31, 69, 22, 189, 43, 165, 41, 117, 12, 87, 53, 405, 25, 147, 26, 153, 47, 375, 91, 297, 34, 93, 61, 315, 59, 111, 20, 729, 119, 195, 71]

cp's OEIS Frontend

A118306 If n = product{k>=1} p(k)^b(n,k), where p(k) is the k-th prime and where each b(n,k) is a nonnegative integer, then: If n occurs earlier in the sequence, then a(n) = product{k>=2} p(k-1)^b(n,k); If n does not occur earlier in the sequence, then a(n) = product{k>=1} p(k+1)^b(n,k).

Table of values

List of values

n	a(n)
1	1
2	3
3	2
4	9
5	7
6	15
7	5
8	27
9	4
10	21
11	13
12	45
13	11
14	33
15	6
16	81
17	19
18	75
19	17
20	63
21	10
22	39
23	29
24	135
25	49
26	51
27	8
28	99
29	23
30	105
31	37
32	243
33	14
34	57
35	77
36	225
37	31
38	69
39	22
40	189
41	43
42	165
43	41
44	117
45	12
46	87
47	53
48	405
49	25
50	147
51	26
52	153
53	47
54	375
55	91
56	297
57	34
58	93
59	61
60	315
61	59
62	111
63	20
64	729
65	119
66	195
67	71

n	a(n)
1	1
2	3
3	2
4	9
5	7
6	15
7	5
8	27
9	4
10	21
11	13
12	45
13	11
14	33
15	6
16	81
17	19
18	75
19	17
20	63
21	10
22	39
23	29
24	135
25	49
26	51
27	8
28	99
29	23
30	105
31	37
32	243
33	14
34	57
35	77
36	225
37	31
38	69
39	22
40	189
41	43
42	165
43	41
44	117
45	12
46	87
47	53
48	405
49	25
50	147
51	26
52	153
53	47
54	375
55	91
56	297
57	34
58	93
59	61
60	315
61	59
62	111
63	20
64	729
65	119
66	195
67	71

n	a(n)
1	1
2	3
3	2
4	9
5	7
6	15
7	5
8	27
9	4
10	21
11	13
12	45
13	11
14	33
15	6
16	81
17	19
18	75
19	17
20	63
21	10
22	39
23	29
24	135
25	49
26	51
27	8
28	99
29	23
30	105
31	37
32	243
33	14
34	57
35	77
36	225
37	31
38	69
39	22
40	189
41	43
42	165
43	41
44	117
45	12
46	87
47	53
48	405
49	25
50	147
51	26
52	153
53	47
54	375
55	91
56	297
57	34
58	93
59	61
60	315
61	59
62	111
63	20
64	729
65	119
66	195
67	71