A277794 - cp's OEIS frontend

A277794 Numbers k such that the sum of proper divisors of k is a prime, and the sum of the numbers less than k that do not divide k is also a prime.

n	a(n)
1	4
2	21
3	85
4	129
5	201
6	237
7	324
8	325
9	517
10	549
11	669
12	837
13	865
14	1081
15	1137
16	1161
17	1165
18	1309
19	1389
20	1677
21	1765
22	2169
23	2233
24	2304
25	2305
26	2469
27	2709
28	2737
29	2761
30	3265
31	3297
32	3745
33	3961
34	4161
35	4285
36	4693
37	4705
38	4741
39	4989
40	5061
41	5221
42	5349
43	5817
44	5949
45	6249
46	6457
47	6517
48	6685
49	6789
50	6813
51	6853
52	6921

[4, 21, 85, 129, 201, 237, 324, 325, 517, 549, 669, 837, 865, 1081, 1137, 1161, 1165, 1309, 1389, 1677, 1765, 2169, 2233, 2304, 2305, 2469, 2709, 2737, 2761, 3265, 3297, 3745, 3961, 4161, 4285, 4693, 4705, 4741, 4989, 5061, 5221, 5349, 5817, 5949, 6249, 6457, 6517, 6685, 6789, 6813, 6853, 6921]

cp's OEIS Frontend

A277794 Numbers k such that the sum of proper divisors of k is a prime, and the sum of the numbers less than k that do not divide k is also a prime.

Table of values

List of values