A336689 - cp's OEIS frontend

A336689 Composite numbers k such that the decimal expansion of ((1/2^((k-1)/2))+1)/k or ((1/2^((k-1)/2))-1)/k is finite.

n	a(n)
1	15
2	25
3	75
4	125
5	175
6	325
7	341
8	375
9	425
10	561
11	625
12	645
13	1105
14	1729
15	1875
16	1905
17	2047
18	2465
19	3125
20	3277
21	4033
22	4375
23	4681
24	5461
25	6025
26	6601
27	8125
28	8321
29	8481
30	8625
31	9375
32	10261
33	10585
34	10625
35	12025
36	12801
37	15625
38	15709
39	15841
40	16705
41	16725
42	18705
43	25761
44	29341

[15, 25, 75, 125, 175, 325, 341, 375, 425, 561, 625, 645, 1105, 1729, 1875, 1905, 2047, 2465, 3125, 3277, 4033, 4375, 4681, 5461, 6025, 6601, 8125, 8321, 8481, 8625, 9375, 10261, 10585, 10625, 12025, 12801, 15625, 15709, 15841, 16705, 16725, 18705, 25761, 29341]

cp's OEIS Frontend

A336689 Composite numbers k such that the decimal expansion of ((1/2^((k-1)/2))+1)/k or ((1/2^((k-1)/2))-1)/k is finite.

Table of values

List of values