A126261 - cp's OEIS frontend

A126261 a(n) is the numerator of the sum of the reciprocals of the positive integers k, k<=n, where every positive integer <= k and coprime to k is also coprime to n.

n	a(n)
1	1
2	3
3	11
4	7
5	137
6	5
7	363
8	49
9	19
10	37
11	83711
12	7
13	1145993
14	167
15	19
16	1321
17	42142223
18	65
19	275295799
20	19
21	43
22	2887
23	444316699
24	133
25	127
26	1177
27	18469
28	85
29	9227046511387
30	23
31	290774257297357
32	3877999
33	212
34	22737
35	971
36	229
37	2040798836801833
38	233731
39	1039

[1, 3, 11, 7, 137, 5, 363, 49, 19, 37, 83711, 7, 1145993, 167, 19, 1321, 42142223, 65, 275295799, 19, 43, 2887, 444316699, 133, 127, 1177, 18469, 85, 9227046511387, 23, 290774257297357, 3877999, 212, 22737, 971, 229, 2040798836801833, 233731, 1039]

cp's OEIS Frontend

A126261 a(n) is the numerator of the sum of the reciprocals of the positive integers k, k<=n, where every positive integer <= k and coprime to k is also coprime to n.

Table of values

List of values