A287620 - cp's OEIS frontend

A287620 a(n) = product, with multiplicity, of the prime numbers appearing at leaf positions in the prime tower factorization of n.

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

[1, 2, 3, 2, 5, 6, 7, 3, 2, 10, 11, 6, 13, 14, 15, 2, 17, 4, 19, 10, 21, 22, 23, 9, 2, 26, 3, 14, 29, 30, 31, 5, 33, 34, 35, 4, 37, 38, 39, 15, 41, 42, 43, 22, 10, 46, 47, 6, 2, 4, 51, 26, 53, 6, 55, 21, 57, 58, 59, 30, 61, 62, 14, 6, 65, 66, 67, 34, 69, 70, 71]

cp's OEIS Frontend

A287620 a(n) = product, with multiplicity, of the prime numbers appearing at leaf positions in the prime tower factorization of n.

Table of values

List of values

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

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

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