A365850 - cp's OEIS frontend

A365850 Numbers k for which k^2 + (k')^2 is a square, where k' is the arithmetic derivative of k (A003415).

n	a(n)
1	0
2	1
3	12
4	15
5	35
6	81
7	143
8	323
9	400
10	441
11	899
12	1540
13	1763
14	2700
15	3599
16	4641
17	5183
18	5929
19	9375
20	10395
21	10403
22	11663
23	13585
24	18225
25	19043
26	21952
27	22499
28	30576
29	32399
30	35581
31	36863
32	39203
33	48841
34	51983
35	57599
36	72899
37	79523
38	97343
39	121103
40	148176
41	166375
42	175692
43	176399

[0, 1, 12, 15, 35, 81, 143, 323, 400, 441, 899, 1540, 1763, 2700, 3599, 4641, 5183, 5929, 9375, 10395, 10403, 11663, 13585, 18225, 19043, 21952, 22499, 30576, 32399, 35581, 36863, 39203, 48841, 51983, 57599, 72899, 79523, 97343, 121103, 148176, 166375, 175692, 176399]

cp's OEIS Frontend

A365850 Numbers k for which k^2 + (k')^2 is a square, where k' is the arithmetic derivative of k (A003415).

Table of values

List of values