A090556 - cp's OEIS frontend

A090556 Beginning with 1, a(n) = least number m > a(n-1) such that phi(a(n-1)) divides phi(m).

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	8
7	10
8	12
9	13
10	21
11	26
12	28
13	35
14	39
15	45
16	52
17	56
18	65
19	97
20	119
21	153
22	193
23	221
24	291
25	357
26	386
27	388
28	416
29	442
30	448
31	476
32	485
33	579
34	595
35	663
36	765
37	769
38	965
39	1105
40	1455
41	1538
42	1544
43	1552
44	1649
45	1799
46	2307
47	2313
48	2895
49	3076
50	3088
51	3104
52	3281
53	3341
54	3845
55	4947

[1, 2, 3, 4, 5, 8, 10, 12, 13, 21, 26, 28, 35, 39, 45, 52, 56, 65, 97, 119, 153, 193, 221, 291, 357, 386, 388, 416, 442, 448, 476, 485, 579, 595, 663, 765, 769, 965, 1105, 1455, 1538, 1544, 1552, 1649, 1799, 2307, 2313, 2895, 3076, 3088, 3104, 3281, 3341, 3845, 4947]

cp's OEIS Frontend

A090556 Beginning with 1, a(n) = least number m > a(n-1) such that phi(a(n-1)) divides phi(m).

Table of values

List of values