A339908 - cp's OEIS frontend

A339908 Odd squarefree numbers k > 1 for which bigomega(phi(k)) < bigomega(k-1), where bigomega gives the number of prime divisors, counted with multiplicity.

n	a(n)
1	33
2	65
3	129
4	141
5	145
6	161
7	177
8	201
9	217
10	249
11	253
12	321
13	385
14	393
15	417
16	501
17	537
18	649
19	681
20	705
21	721
22	737
23	849
24	865
25	897
26	913
27	973
28	993
29	1041
30	1057
31	1081
32	1101
33	1121
34	1135
35	1149
36	1169
37	1177
38	1281
39	1329
40	1345
41	1401
42	1441
43	1457
44	1473
45	1497
46	1509
47	1537
48	1561
49	1569
50	1585
51	1633
52	1689
53	1729
54	1761
55	1793
56	1821
57	1837
58	1841

[33, 65, 129, 141, 145, 161, 177, 201, 217, 249, 253, 321, 385, 393, 417, 501, 537, 649, 681, 705, 721, 737, 849, 865, 897, 913, 973, 993, 1041, 1057, 1081, 1101, 1121, 1135, 1149, 1169, 1177, 1281, 1329, 1345, 1401, 1441, 1457, 1473, 1497, 1509, 1537, 1561, 1569, 1585, 1633, 1689, 1729, 1761, 1793, 1821, 1837, 1841]

cp's OEIS Frontend

A339908 Odd squarefree numbers k > 1 for which bigomega(phi(k)) < bigomega(k-1), where bigomega gives the number of prime divisors, counted with multiplicity.

Table of values

List of values