A139084 - cp's OEIS frontend

A139084 a(n) = (smallest prime-power among the largest powers dividing n of each prime dividing n) * (smallest prime-power among the largest powers dividing (n+1) of each prime dividing (n+1)).

n	a(n)
1	2
2	6
3	12
4	20
5	10
6	14
7	56
8	72
9	18
10	22
11	33
12	39
13	26
14	6
15	48
16	272
17	34
18	38
19	76
20	12
21	6
22	46
23	69
24	75
25	50
26	54
27	108
28	116
29	58
30	62
31	992
32	96
33	6
34	10
35	20
36	148
37	74
38	6
39	15
40	205
41	82
42	86
43	172
44	20
45	10
46	94
47	141
48	147
49	98
50	6
51	12
52	212
53	106
54	10
55	35
56	21
57	6
58	118
59	177
60	183
61	122
62	14
63	448
64	320
65	10
66	134

[2, 6, 12, 20, 10, 14, 56, 72, 18, 22, 33, 39, 26, 6, 48, 272, 34, 38, 76, 12, 6, 46, 69, 75, 50, 54, 108, 116, 58, 62, 992, 96, 6, 10, 20, 148, 74, 6, 15, 205, 82, 86, 172, 20, 10, 94, 141, 147, 98, 6, 12, 212, 106, 10, 35, 21, 6, 118, 177, 183, 122, 14, 448, 320, 10, 134]

cp's OEIS Frontend

A139084 a(n) = (smallest prime-power among the largest powers dividing n of each prime dividing n) * (smallest prime-power among the largest powers dividing (n+1) of each prime dividing (n+1)).

Table of values

List of values

n	a(n)
1	2
2	6
3	12
4	20
5	10
6	14
7	56
8	72
9	18
10	22
11	33
12	39
13	26
14	6
15	48
16	272
17	34
18	38
19	76
20	12
21	6
22	46
23	69
24	75
25	50
26	54
27	108
28	116
29	58
30	62
31	992
32	96
33	6
34	10
35	20
36	148
37	74
38	6
39	15
40	205
41	82
42	86
43	172
44	20
45	10
46	94
47	141
48	147
49	98
50	6
51	12
52	212
53	106
54	10
55	35
56	21
57	6
58	118
59	177
60	183
61	122
62	14
63	448
64	320
65	10
66	134

n	a(n)
1	2
2	6
3	12
4	20
5	10
6	14
7	56
8	72
9	18
10	22
11	33
12	39
13	26
14	6
15	48
16	272
17	34
18	38
19	76
20	12
21	6
22	46
23	69
24	75
25	50
26	54
27	108
28	116
29	58
30	62
31	992
32	96
33	6
34	10
35	20
36	148
37	74
38	6
39	15
40	205
41	82
42	86
43	172
44	20
45	10
46	94
47	141
48	147
49	98
50	6
51	12
52	212
53	106
54	10
55	35
56	21
57	6
58	118
59	177
60	183
61	122
62	14
63	448
64	320
65	10
66	134

n	a(n)
1	2
2	6
3	12
4	20
5	10
6	14
7	56
8	72
9	18
10	22
11	33
12	39
13	26
14	6
15	48
16	272
17	34
18	38
19	76
20	12
21	6
22	46
23	69
24	75
25	50
26	54
27	108
28	116
29	58
30	62
31	992
32	96
33	6
34	10
35	20
36	148
37	74
38	6
39	15
40	205
41	82
42	86
43	172
44	20
45	10
46	94
47	141
48	147
49	98
50	6
51	12
52	212
53	106
54	10
55	35
56	21
57	6
58	118
59	177
60	183
61	122
62	14
63	448
64	320
65	10
66	134