A190266 - cp's OEIS frontend

A190266 Numbers k such that tau(k-1) = (tau(k))^2 = tau(k+1), where tau(k) = A000005(k) (number of divisors of k).

n	a(n)
1	7
2	1241
3	1673
4	1751
5	1769
6	2471
7	2839
8	3161
9	3305
10	3497
11	3711
12	4135
13	4265
14	4279
15	4471
16	4711
17	5191
18	5433
19	5561
20	6017
21	6041
22	6103
23	6313
24	6809
25	6953
26	7031
27	7241
28	7463
29	7671
30	8023
31	8057
32	8345
33	8791
34	8889
35	9079
36	10167
37	10793
38	10841
39	11111
40	11209
41	11391
42	11751
43	12297
44	12729

[7, 1241, 1673, 1751, 1769, 2471, 2839, 3161, 3305, 3497, 3711, 4135, 4265, 4279, 4471, 4711, 5191, 5433, 5561, 6017, 6041, 6103, 6313, 6809, 6953, 7031, 7241, 7463, 7671, 8023, 8057, 8345, 8791, 8889, 9079, 10167, 10793, 10841, 11111, 11209, 11391, 11751, 12297, 12729]

cp's OEIS Frontend

A190266 Numbers k such that tau(k-1) = (tau(k))^2 = tau(k+1), where tau(k) = A000005(k) (number of divisors of k).

Table of values

List of values