A383188 - cp's OEIS frontend

A383188 Irregular table, read by rows, where row z = 2, 3, 4, ... lists pairs (y, x) such that x + y/z = concat(y, x)/z with 0 < y < z, gcd(y, z) = 1, and primitive x, cf. comments.

n	a(n)
2	1
3	9
4	2
5	9
6	1
7	3
8	3
9	9
10	4
11	9
12	5
13	9
14	2
15	3
16	4
17	6
18	6
19	9
20	1
21	142857
22	3
23	428571
24	5
25	714285
26	7
27	9
28	8
29	9
30	3
31	3
32	7
33	7
34	9
35	9
36	10
37	9
38	5
39	45
40	7
41	63
42	11
43	9
44	4
45	3
46	8
47	6
48	12
49	9
50	3
51	230769
52	5
53	384615
54	7
55	538461
56	11
57	846153
58	13
59	9
60	2
61	142857
62	4
63	285714
64	8
65	571428
66	14
67	9
68	5
69	3
70	15
71	9
72	16
73	9
74	5
75	2941176470588235
76	7
77	4117647058823529
78	11
79	6470588235294117
80	13
81	7647058823529411
82	17
83	9
84	2
85	1
86	4
87	2
88	6
89	3
90	8
91	4
92	10
93	5
94	12
95	6
96	14
97	7
98	16
99	8
100	18
101	9

[1, 9, 2, 9, 1, 3, 3, 9, 4, 9, 5, 9, 2, 3, 4, 6, 6, 9, 1, 142857, 3, 428571, 5, 714285, 7, 9, 8, 9, 3, 3, 7, 7, 9, 9, 10, 9, 5, 45, 7, 63, 11, 9, 4, 3, 8, 6, 12, 9, 3, 230769, 5, 384615, 7, 538461, 11, 846153, 13, 9, 2, 142857, 4, 285714, 8, 571428, 14, 9, 5, 3, 15, 9, 16, 9, 5, 2941176470588235, 7, 4117647058823529, 11, 6470588235294117, 13, 7647058823529411, 17, 9, 2, 1, 4, 2, 6, 3, 8, 4, 10, 5, 12, 6, 14, 7, 16, 8, 18, 9]

cp's OEIS Frontend

A383188 Irregular table, read by rows, where row z = 2, 3, 4, ... lists pairs (y, x) such that x + y/z = concat(y, x)/z with 0 < y < z, gcd(y, z) = 1, and primitive x, cf. comments.

Table of values

List of values