A376222 - cp's OEIS frontend

A376222 Numbers k such that Sum_{i=1..q-1} d(i)^i is prime, where d(1) are the q divisors of k.

n	a(n)
1	4
2	21
3	27
4	39
5	57
6	77
7	183
8	189
9	203
10	205
11	219
12	237
13	253
14	371
15	387
16	391
17	417
18	489
19	565
20	611
21	655
22	667
23	669
24	675
25	687
26	749
27	767
28	799
29	831
30	849
31	897
32	921
33	955
34	1007
35	1047
36	1135
37	1189
38	1207
39	1349
40	1371
41	1379
42	1407
43	1421
44	1461
45	1469
46	1497
47	1513
48	1569
49	1633
50	1643
51	1659

[4, 21, 27, 39, 57, 77, 183, 189, 203, 205, 219, 237, 253, 371, 387, 391, 417, 489, 565, 611, 655, 667, 669, 675, 687, 749, 767, 799, 831, 849, 897, 921, 955, 1007, 1047, 1135, 1189, 1207, 1349, 1371, 1379, 1407, 1421, 1461, 1469, 1497, 1513, 1569, 1633, 1643, 1659]

cp's OEIS Frontend

A376222 Numbers k such that Sum_{i=1..q-1} d(i)^i is prime, where d(1) are the q divisors of k.

Table of values

List of values