A210935 - cp's OEIS frontend

A210935 Numbers n for which n*n'/(n+n') is an integer, where n' is the arithmetic derivative of n.

n	a(n)
1	1
2	4
3	64
4	80
5	108
6	270
7	351
8	432
9	729
10	768
11	864
12	2916
13	5184
14	5832
15	6250
16	6912
17	12096
18	13500
19	16384
20	25600
21	32832
22	34992
23	37500
24	39366
25	43200
26	46656
27	50000
28	73008
29	74304
30	81648
31	84375
32	110592
33	131250
34	138240
35	143748
36	153664
37	172800
38	176418
39	200000
40	225000

[1, 4, 64, 80, 108, 270, 351, 432, 729, 768, 864, 2916, 5184, 5832, 6250, 6912, 12096, 13500, 16384, 25600, 32832, 34992, 37500, 39366, 43200, 46656, 50000, 73008, 74304, 81648, 84375, 110592, 131250, 138240, 143748, 153664, 172800, 176418, 200000, 225000]

cp's OEIS Frontend

A210935 Numbers n for which n*n'/(n+n') is an integer, where n' is the arithmetic derivative of n.

Table of values

List of values