A099642 - cp's OEIS frontend

A099642 a(n) is the smallest nonprime k such that tau(k + n) = tau(k) + n , where tau(n) is the number of divisors of n (A000005).

n	a(n)
1	1
2	10
3	9
4	26
5	25
6	74
7	169
8	82
9	441
10	170
11	133
12	348
13	6889
14	166
15	3025
16	344
17	559
18	1602
19	9981
20	820
21	9979
22	986
23	4333
24	1236
25	9191
26	694
27	3249
28	1652
29	3481
30	9378
31	34969
32	3118
33	859329
34	5636
35	36829
36	3324
37	51947
38	3994
39	6561
40	5000
41	15835
42	16806
43	944741
44	6436
45	119025

[1, 10, 9, 26, 25, 74, 169, 82, 441, 170, 133, 348, 6889, 166, 3025, 344, 559, 1602, 9981, 820, 9979, 986, 4333, 1236, 9191, 694, 3249, 1652, 3481, 9378, 34969, 3118, 859329, 5636, 36829, 3324, 51947, 3994, 6561, 5000, 15835, 16806, 944741, 6436, 119025]

cp's OEIS Frontend

A099642 a(n) is the smallest nonprime k such that tau(k + n) = tau(k) + n , where tau(n) is the number of divisors of n (A000005).

Table of values

List of values