A263319 - cp's OEIS frontend

A263319 a(n) = pi(n^2)*phi(n)/2, where pi(x) denotes the number of primes not exceeding x, and phi(.) is Euler's totient function given by A000010.

n	a(n)
1	0
2	1
3	4
4	6
5	18
6	11
7	45
8	36
9	66
10	50
11	150
12	68
13	234
14	132
15	192
16	216
17	488
18	198
19	648
20	312
21	510
22	460
23	1089
24	420
25	1140
26	732
27	1161
28	822
29	2044
30	616
31	2430
32	1376
33	1810
34	1528
35	2400
36	1260
37	3942
38	2052
39	2880
40	2008
41	5260
42	1644
43	5943
44	2950
45	3672
46	3509
47	7567
48	2736
49	7497
50	3670

[0, 1, 4, 6, 18, 11, 45, 36, 66, 50, 150, 68, 234, 132, 192, 216, 488, 198, 648, 312, 510, 460, 1089, 420, 1140, 732, 1161, 822, 2044, 616, 2430, 1376, 1810, 1528, 2400, 1260, 3942, 2052, 2880, 2008, 5260, 1644, 5943, 2950, 3672, 3509, 7567, 2736, 7497, 3670]

cp's OEIS Frontend

A263319 a(n) = pi(n^2)*phi(n)/2, where pi(x) denotes the number of primes not exceeding x, and phi(.) is Euler's totient function given by A000010.

Table of values

List of values