A066782 - cp's OEIS frontend

A066782 Numbers k such that (k, phi(k)) lies on the hyperbola x^2 - y^2 = m^2, for some natural number m, i.e., k^2 - phi(k)^2 is a square.

n	a(n)
1	1
2	5
3	13
4	25
5	34
6	41
7	61
8	68
9	113
10	125
11	136
12	169
13	181
14	219
15	222
16	272
17	313
18	390
19	421
20	444
21	482
22	544
23	578
24	613
25	625
26	657
27	666
28	761
29	780
30	888
31	964
32	979
33	1013
34	1088
35	1156
36	1170
37	1201
38	1301
39	1332
40	1560
41	1681
42	1741
43	1776
44	1861

[1, 5, 13, 25, 34, 41, 61, 68, 113, 125, 136, 169, 181, 219, 222, 272, 313, 390, 421, 444, 482, 544, 578, 613, 625, 657, 666, 761, 780, 888, 964, 979, 1013, 1088, 1156, 1170, 1201, 1301, 1332, 1560, 1681, 1741, 1776, 1861]

cp's OEIS Frontend

A066782 Numbers k such that (k, phi(k)) lies on the hyperbola x^2 - y^2 = m^2, for some natural number m, i.e., k^2 - phi(k)^2 is a square.

Table of values

List of values