A071964 - cp's OEIS frontend

A071964 Numbers k such that k = Gpf(k) * Gpf(phi(k)) where Gpf(k) = A006530(k) is the greatest prime factor of k.

n	a(n)
1	4
2	6
3	9
4	10
5	21
6	25
7	34
8	39
9	49
10	55
11	57
12	111
13	121
14	155
15	169
16	203
17	205
18	219
19	253
20	289
21	291
22	301
23	305
24	327
25	361
26	489
27	497
28	505
29	514
30	529
31	579
32	689
33	737
34	755
35	791
36	841
37	889
38	905
39	961
40	979
41	1027
42	1081
43	1205
44	1255
45	1299
46	1355
47	1369
48	1379
49	1461
50	1477
51	1681
52	1703

[4, 6, 9, 10, 21, 25, 34, 39, 49, 55, 57, 111, 121, 155, 169, 203, 205, 219, 253, 289, 291, 301, 305, 327, 361, 489, 497, 505, 514, 529, 579, 689, 737, 755, 791, 841, 889, 905, 961, 979, 1027, 1081, 1205, 1255, 1299, 1355, 1369, 1379, 1461, 1477, 1681, 1703]

cp's OEIS Frontend

A071964 Numbers k such that k = Gpf(k) * Gpf(phi(k)) where Gpf(k) = A006530(k) is the greatest prime factor of k.

Table of values

List of values