A361078 - cp's OEIS frontend

A361078 Numbers k for which k = gcd(k', k"), where k' is the arithmetic derivative of k (A003415) and k" is the second derivative of k (A068346).

n	a(n)
1	4
2	16
3	27
4	64
5	108
6	432
7	729
8	1024
9	2916
10	3125
11	4096
12	6912
13	12500
14	16384
15	19683
16	27648
17	46656
18	50000
19	84375
20	110592
21	186624
22	314928
23	337500
24	746496
25	800000
26	823543
27	1048576
28	1259712
29	2125764
30	2278125
31	3200000
32	3294172
33	4194304
34	5038848
35	5400000
36	7077888
37	8503056

[4, 16, 27, 64, 108, 432, 729, 1024, 2916, 3125, 4096, 6912, 12500, 16384, 19683, 27648, 46656, 50000, 84375, 110592, 186624, 314928, 337500, 746496, 800000, 823543, 1048576, 1259712, 2125764, 2278125, 3200000, 3294172, 4194304, 5038848, 5400000, 7077888, 8503056]

cp's OEIS Frontend

A361078 Numbers k for which k = gcd(k', k"), where k' is the arithmetic derivative of k (A003415) and k" is the second derivative of k (A068346).

Table of values

List of values