A347887 - cp's OEIS frontend

A347887 Odd numbers k for which A003415(sigma(k^2))-(k^2) is strictly positive and even. Here A003415 is the arithmetic derivative.

n	a(n)
1	201
2	231
3	237
4	259
5	273
6	315
7	333
8	399
9	429
10	455
11	483
12	525
13	555
14	585
15	627
16	651
17	665
18	741
19	763
20	855
21	903
22	975
23	1057
24	1071
25	1085
26	1113
27	1209
28	1235
29	1351
30	1395
31	1407
32	1505
33	1533
34	1635
35	1659
36	1677
37	1767
38	1785
39	1935
40	2037
41	2079
42	2163
43	2211
44	2265
45	2317
46	2331
47	2345
48	2451
49	2457
50	2479
51	2541
52	2555
53	2583
54	2607
55	2611
56	2613

[201, 231, 237, 259, 273, 315, 333, 399, 429, 455, 483, 525, 555, 585, 627, 651, 665, 741, 763, 855, 903, 975, 1057, 1071, 1085, 1113, 1209, 1235, 1351, 1395, 1407, 1505, 1533, 1635, 1659, 1677, 1767, 1785, 1935, 2037, 2079, 2163, 2211, 2265, 2317, 2331, 2345, 2451, 2457, 2479, 2541, 2555, 2583, 2607, 2611, 2613]

cp's OEIS Frontend

A347887 Odd numbers k for which A003415(sigma(k^2))-(k^2) is strictly positive and even. Here A003415 is the arithmetic derivative.

Table of values

List of values