A179192 - cp's OEIS frontend

A179192 Numbers n, not relatively prime to 10, such that the decimal form of the period of 1/n is prime.

n	a(n)
1	12
2	18
3	30
4	36
5	45
6	48
7	75
8	120
9	180
10	192
11	198
12	270
13	288
14	300
15	330
16	360
17	450
18	480
19	495
20	750
21	768
22	1152
23	1200
24	1584
25	1800
26	1875
27	1920
28	1980
29	1998
30	2304
31	2700
32	2880
33	3000
34	3072
35	3300
36	3330
37	3600
38	3690
39	4500
40	4800
41	4950
42	4995
43	5625
44	7500
45	7680
46	9090
47	11520
48	12000
49	12288
50	15840
51	18000
52	18432
53	18750
54	19200
55	19800
56	19980
57	19998

[12, 18, 30, 36, 45, 48, 75, 120, 180, 192, 198, 270, 288, 300, 330, 360, 450, 480, 495, 750, 768, 1152, 1200, 1584, 1800, 1875, 1920, 1980, 1998, 2304, 2700, 2880, 3000, 3072, 3300, 3330, 3600, 3690, 4500, 4800, 4950, 4995, 5625, 7500, 7680, 9090, 11520, 12000, 12288, 15840, 18000, 18432, 18750, 19200, 19800, 19980, 19998]

cp's OEIS Frontend

A179192 Numbers n, not relatively prime to 10, such that the decimal form of the period of 1/n is prime.

Table of values

List of values