A190120 - cp's OEIS frontend

A190120 a(n) = Sum_{k=1..n} lcm(k,k')/gcd(k,k'), where n' is arithmetic derivative of n.

n	a(n)
1	0
2	2
3	5
4	6
5	11
6	41
7	48
8	54
9	60
10	130
11	141
12	153
13	166
14	292
15	412
16	414
17	431
18	473
19	492
20	522
21	732
22	1018
23	1041
24	1107
25	1117
26	1507
27	1508
28	1564
29	1593
30	2523
31	2554
32	2564
33	3026
34	3672
35	4092
36	4107
37	4144
38	4942
39	5566
40	5736
41	5777
42	7499
43	7542
44	7674
45	7869
46	9019
47	9066
48	9087
49	9101
50	9191

[0, 2, 5, 6, 11, 41, 48, 54, 60, 130, 141, 153, 166, 292, 412, 414, 431, 473, 492, 522, 732, 1018, 1041, 1107, 1117, 1507, 1508, 1564, 1593, 2523, 2554, 2564, 3026, 3672, 4092, 4107, 4144, 4942, 5566, 5736, 5777, 7499, 7542, 7674, 7869, 9019, 9066, 9087, 9101, 9191]

cp's OEIS Frontend

A190120 a(n) = Sum_{k=1..n} lcm(k,k')/gcd(k,k'), where n' is arithmetic derivative of n.

Table of values

List of values