A335131 - cp's OEIS frontend

A335131 a(n) = Sum_{k=1..n} phi(k)phi(k+1)phi(k+2), where phi(k) = A000010(k) is Euler's totient function.

n	a(n)
1	2
2	6
3	22
4	38
5	86
6	134
7	278
8	374
9	614
10	774
11	1254
12	1542
13	2118
14	2502
15	3526
16	4294
17	6022
18	6886
19	8614
20	9574
21	12214
22	13974
23	17494
24	19414
25	23734
26	26326
27	32374
28	35062
29	41782
30	45622
31	55222
32	60342
33	68022
34	72630
35	82998
36	90774
37	106326
38	113238
39	128598
40	136278
41	156438
42	166518

[2, 6, 22, 38, 86, 134, 278, 374, 614, 774, 1254, 1542, 2118, 2502, 3526, 4294, 6022, 6886, 8614, 9574, 12214, 13974, 17494, 19414, 23734, 26326, 32374, 35062, 41782, 45622, 55222, 60342, 68022, 72630, 82998, 90774, 106326, 113238, 128598, 136278, 156438, 166518]

cp's OEIS Frontend

A335131 a(n) = Sum_{k=1..n} phi(k)phi(k+1)phi(k+2), where phi(k) = A000010(k) is Euler's totient function.

Table of values

List of values

cp's OEIS Frontend

A335131 a(n) = Sum_{k=1..n} phi(k)*phi(k+1)*phi(k+2), where phi(k) = A000010(k) is Euler's totient function.

Table of values

List of values

A335131 a(n) = Sum_{k=1..n} phi(k)phi(k+1)phi(k+2), where phi(k) = A000010(k) is Euler's totient function.