A277366 - cp's OEIS frontend

A277366 Composite numbers k such that phi(k)*lambda(k) divides (k-1)^2, where phi(k) = A000010(k) and lambda(k) = A002322(k).

n	a(n)
1	1729
2	670033
3	6840001
4	83099521
5	193708801
6	321197185
7	367804801
8	484662529
9	1752710401
10	2320690177
11	5064928705
12	12820178449
13	32220147601
14	257124585601
15	270177600001
16	301036080385
17	7043394657601
18	13237329899521
19	14276860416001
20	85661522006401
21	119377939968001

[1729, 670033, 6840001, 83099521, 193708801, 321197185, 367804801, 484662529, 1752710401, 2320690177, 5064928705, 12820178449, 32220147601, 257124585601, 270177600001, 301036080385, 7043394657601, 13237329899521, 14276860416001, 85661522006401, 119377939968001]

cp's OEIS Frontend

A277366 Composite numbers k such that phi(k)*lambda(k) divides (k-1)^2, where phi(k) = A000010(k) and lambda(k) = A002322(k).

Table of values

List of values