A133951 - cp's OEIS frontend

A133951 a(n) is the number of "non-isolated divisors" of n!. A positive divisor k of n is non-isolated if either k-1 or k+1 also divides n.

n	a(n)
1	0
2	2
3	3
4	4
5	6
6	11
7	17
8	19
9	23
10	27
11	43
12	43
13	64
14	74
15	80
16	82
17	124
18	124
19	177
20	185
21	195
22	214
23	300
24	300
25	300
26	328
27	328
28	334
29	454
30	454
31	618
32	618
33	635
34	677
35	677
36	677
37	872
38	936
39	949
40	949
41	1224
42	1228
43	1579
44	1587
45	1587
46	1672
47	2124
48	2124
49	2126
50	2126
51	2148
52	2154
53	2707
54	2707
55	2709
56	2709

[0, 2, 3, 4, 6, 11, 17, 19, 23, 27, 43, 43, 64, 74, 80, 82, 124, 124, 177, 185, 195, 214, 300, 300, 300, 328, 328, 334, 454, 454, 618, 618, 635, 677, 677, 677, 872, 936, 949, 949, 1224, 1228, 1579, 1587, 1587, 1672, 2124, 2124, 2126, 2126, 2148, 2154, 2707, 2707, 2709, 2709]

cp's OEIS Frontend

A133951 a(n) is the number of "non-isolated divisors" of n!. A positive divisor k of n is non-isolated if either k-1 or k+1 also divides n.

Table of values

List of values