A067720 - cp's OEIS frontend

A067720 Numbers k such that phi(k^2+1) = k*phi(k+1).

n	a(n)
1	1
2	2
3	4
4	6
5	8
6	10
7	16
8	36
9	40
10	66
11	126
12	130
13	150
14	156
15	180
16	210
17	240
18	250
19	256
20	270
21	280
22	306
23	396
24	400
25	420
26	430
27	466
28	490
29	556
30	570
31	576
32	646
33	690
34	700
35	750
36	760
37	826
38	906
39	910
40	936
41	946
42	966
43	1060
44	1096
45	1150
46	1276
47	1290
48	1306
49	1320
50	1366
51	1566
52	1570

[1, 2, 4, 6, 8, 10, 16, 36, 40, 66, 126, 130, 150, 156, 180, 210, 240, 250, 256, 270, 280, 306, 396, 400, 420, 430, 466, 490, 556, 570, 576, 646, 690, 700, 750, 760, 826, 906, 910, 936, 946, 966, 1060, 1096, 1150, 1276, 1290, 1306, 1320, 1366, 1566, 1570]

cp's OEIS Frontend

A067720 Numbers k such that phi(k^2+1) = k*phi(k+1).

Table of values

List of values