A190117 - cp's OEIS frontend

A190117 a(n) = Sum_{k=1..n} k*k', where n' is the arithmetic derivative of n.

n	a(n)
1	0
2	2
3	5
4	21
5	26
6	56
7	63
8	159
9	213
10	283
11	294
12	486
13	499
14	625
15	745
16	1257
17	1274
18	1652
19	1671
20	2151
21	2361
22	2647
23	2670
24	3726
25	3976
26	4366
27	5095
28	5991
29	6020
30	6950
31	6981
32	9541
33	10003
34	10649
35	11069
36	13229
37	13266
38	14064
39	14688
40	17408
41	17449
42	19171
43	19214
44	21326
45	23081
46	24231
47	24278
48	29654
49	30340
50	32590

[0, 2, 5, 21, 26, 56, 63, 159, 213, 283, 294, 486, 499, 625, 745, 1257, 1274, 1652, 1671, 2151, 2361, 2647, 2670, 3726, 3976, 4366, 5095, 5991, 6020, 6950, 6981, 9541, 10003, 10649, 11069, 13229, 13266, 14064, 14688, 17408, 17449, 19171, 19214, 21326, 23081, 24231, 24278, 29654, 30340, 32590]

cp's OEIS Frontend

A190117 a(n) = Sum_{k=1..n} k*k', where n' is the arithmetic derivative of n.

Table of values

List of values