A272060 - cp's OEIS frontend

A272060 Numbers k such that sigma((k-1)/2) + tau((k-1)/2) is prime.

n	a(n)
1	3
2	5
3	17
4	257
5	325
6	1025
7	65537
8	82945
9	202501
10	250001
11	2829125
12	7496645
13	10240001
14	13675205
15	16000001
16	27060805
17	48469445
18	71402501
19	133448705
20	150062501
21	156250001
22	172186885
23	182250001
24	343064485
25	354117125
26	453519617
27	467943425
28	1235663105

[3, 5, 17, 257, 325, 1025, 65537, 82945, 202501, 250001, 2829125, 7496645, 10240001, 13675205, 16000001, 27060805, 48469445, 71402501, 133448705, 150062501, 156250001, 172186885, 182250001, 343064485, 354117125, 453519617, 467943425, 1235663105]

cp's OEIS Frontend

A272060 Numbers k such that sigma((k-1)/2) + tau((k-1)/2) is prime.

Table of values

List of values