A057920 - cp's OEIS frontend

A057920 Numbers k such that phi(k+1) divides phi(k), where phi is A000010.

n	a(n)
1	1
2	3
3	5
4	13
5	15
6	35
7	37
8	61
9	73
10	104
11	119
12	157
13	164
14	193
15	194
16	255
17	277
18	313
19	397
20	421
21	455
22	457
23	495
24	527
25	541
26	545
27	584
28	613
29	629
30	661
31	665
32	673
33	733
34	757
35	877
36	975
37	997
38	1085
39	1093
40	1153
41	1201
42	1213
43	1237
44	1295
45	1321
46	1381
47	1453
48	1469
49	1621
50	1657
51	1753

[1, 3, 5, 13, 15, 35, 37, 61, 73, 104, 119, 157, 164, 193, 194, 255, 277, 313, 397, 421, 455, 457, 495, 527, 541, 545, 584, 613, 629, 661, 665, 673, 733, 757, 877, 975, 997, 1085, 1093, 1153, 1201, 1213, 1237, 1295, 1321, 1381, 1453, 1469, 1621, 1657, 1753]

cp's OEIS Frontend

A057920 Numbers k such that phi(k+1) divides phi(k), where phi is A000010.

Table of values

List of values