A175199 - cp's OEIS frontend

A175199 a(n) is the smallest integer k such that sigma_2(k) = sigma_2(k + 2n), where sigma_2(k) is the sum of squares of divisors of k (A001157).

n	a(n)
1	24
2	430
3	645
4	860
5	120
6	864
7	168
8	1720
9	1935
10	10790
11	264
12	2580
13	2795
14	1570
15	16185
16	3440
17	408
18	3870
19	456
20	21580
21	2355
22	4730
23	552
24	5160
25	600
26	5590
27	5805
28	3140
29	696
30	4320
31	744
32	6880
33	7095
34	1248
35	840
36	7740
37	888
38	8170
39	8385
40	43160
41	984
42	4710
43	1032
44	9460

[24, 430, 645, 860, 120, 864, 168, 1720, 1935, 10790, 264, 2580, 2795, 1570, 16185, 3440, 408, 3870, 456, 21580, 2355, 4730, 552, 5160, 600, 5590, 5805, 3140, 696, 4320, 744, 6880, 7095, 1248, 840, 7740, 888, 8170, 8385, 43160, 984, 4710, 1032, 9460]

cp's OEIS Frontend

A175199 a(n) is the smallest integer k such that sigma_2(k) = sigma_2(k + 2n), where sigma_2(k) is the sum of squares of divisors of k (A001157).

Table of values

List of values