A189825 - cp's OEIS frontend

A189825 Least number k such that d(k-1) + d(k+1) = n, where d(k) is the number of divisors of k.

n	a(n)
3	2
4	4
5	3
6	14
7	5
8	7
9	15
10	11
11	17
12	19
13	35
14	29
15	65
16	41
17	101
18	79
19	143
20	71
21	197
22	161
23	323
24	169
25	2917
26	181
27	577
28	239
29	575
30	629
31	899
32	419
33	1297
34	701
35	901
36	721
37	25599
38	881
39	5183
40	1121
41	9215
42	2351
43	4901
44	1079
45	107585
46	1681
47	36863
48	2159
49	3601
50	2881
51	11663
52	2519

[2, 4, 3, 14, 5, 7, 15, 11, 17, 19, 35, 29, 65, 41, 101, 79, 143, 71, 197, 161, 323, 169, 2917, 181, 577, 239, 575, 629, 899, 419, 1297, 701, 901, 721, 25599, 881, 5183, 1121, 9215, 2351, 4901, 1079, 107585, 1681, 36863, 2159, 3601, 2881, 11663, 2519]

cp's OEIS Frontend

A189825 Least number k such that d(k-1) + d(k+1) = n, where d(k) is the number of divisors of k.

Table of values

List of values