A247086 - cp's OEIS frontend

A247086 Integers k such that numerator and denominator of sigma(k)/k are both prime.

n	a(n)
1	2
2	12
3	24
4	90
5	234
6	528
7	588
8	1456
9	4320
10	4680
11	9024
12	11466
13	26208
14	35640
15	55104
16	55552
17	90816
18	114660
19	121024
20	123648
21	185562
22	199584
23	297600
24	510720
25	674880
26	2142720
27	2190336
28	4112640
29	4316928
30	5322240
31	5659641
32	7600320
33	8714160
34	10281600
35	12999168
36	15268368

[2, 12, 24, 90, 234, 528, 588, 1456, 4320, 4680, 9024, 11466, 26208, 35640, 55104, 55552, 90816, 114660, 121024, 123648, 185562, 199584, 297600, 510720, 674880, 2142720, 2190336, 4112640, 4316928, 5322240, 5659641, 7600320, 8714160, 10281600, 12999168, 15268368]

cp's OEIS Frontend

A247086 Integers k such that numerator and denominator of sigma(k)/k are both prime.

Table of values

List of values