A063986 - cp's OEIS frontend

A063986 Numbers k that divide Sum_{j=1..k} A051953(j) where A051953(j) = j - Phi(j). Arithmetic mean of first k cototient values is an integer.

n	a(n)
1	1
2	4
3	5
4	24
5	25
6	249
7	600
8	617
9	12272
10	13763
11	21332
12	25228
13	783665
14	15748051
15	41846733
16	195853251
17	2488541984
18	14399065016
19	21119309213
20	22430204140
21	43787603128
22	157825075944
23	206651865067
24	271605149320
25	374049315076
26	650288309748

[1, 4, 5, 24, 25, 249, 600, 617, 12272, 13763, 21332, 25228, 783665, 15748051, 41846733, 195853251, 2488541984, 14399065016, 21119309213, 22430204140, 43787603128, 157825075944, 206651865067, 271605149320, 374049315076, 650288309748]

cp's OEIS Frontend

A063986 Numbers k that divide Sum_{j=1..k} A051953(j) where A051953(j) = j - Phi(j). Arithmetic mean of first k cototient values is an integer.

Table of values

List of values