A070002 - cp's OEIS frontend

A070002 Numbers k such that phi(P(k)) - P(phi(k)) = 1, where P(k) is the largest prime factor of k.

n	a(n)
1	45
2	90
3	135
4	175
5	180
6	270
7	350
8	360
9	405
10	525
11	540
12	700
13	720
14	810
15	875
16	1050
17	1080
18	1215
19	1400
20	1440
21	1573
22	1575
23	1620
24	1750
25	2100
26	2160
27	2430
28	2625
29	2800
30	2880
31	3146
32	3150
33	3240
34	3500
35	3645
36	4200
37	4320
38	4375
39	4719
40	4725
41	4860
42	5250
43	5491
44	5600
45	5760

[45, 90, 135, 175, 180, 270, 350, 360, 405, 525, 540, 700, 720, 810, 875, 1050, 1080, 1215, 1400, 1440, 1573, 1575, 1620, 1750, 2100, 2160, 2430, 2625, 2800, 2880, 3146, 3150, 3240, 3500, 3645, 4200, 4320, 4375, 4719, 4725, 4860, 5250, 5491, 5600, 5760]

cp's OEIS Frontend

A070002 Numbers k such that phi(P(k)) - P(phi(k)) = 1, where P(k) is the largest prime factor of k.

Table of values

List of values