A128283 - cp's OEIS frontend

A128283 Numbers of the form m = p1 * p2 where for each d|m we have (d+m/d)/2 prime and p1 < p2 both prime.

n	a(n)
1	21
2	33
3	57
4	85
5	93
6	133
7	145
8	177
9	205
10	213
11	217
12	253
13	393
14	445
15	553
16	565
17	633
18	697
19	793
20	817
21	865
22	913
23	933
24	973
25	1137
26	1285
27	1345
28	1417
29	1437
30	1465
31	1477
32	1513
33	1537
34	1717
35	1765
36	1837
37	1857
38	1893
39	2101
40	2173
41	2245
42	2305
43	2517
44	2577
45	2581
46	2605
47	2641
48	2653
49	2733
50	2761

[21, 33, 57, 85, 93, 133, 145, 177, 205, 213, 217, 253, 393, 445, 553, 565, 633, 697, 793, 817, 865, 913, 933, 973, 1137, 1285, 1345, 1417, 1437, 1465, 1477, 1513, 1537, 1717, 1765, 1837, 1857, 1893, 2101, 2173, 2245, 2305, 2517, 2577, 2581, 2605, 2641, 2653, 2733, 2761]

cp's OEIS Frontend

A128283 Numbers of the form m = p1 * p2 where for each d|m we have (d+m/d)/2 prime and p1 < p2 both prime.

Table of values

List of values