A333172 - cp's OEIS frontend

A333172 a(n) = Sum_{k=0..n} sigma(k^2 + 1), where sigma(k) is the sum of divisors of k (A000203).

n	a(n)
0	1
1	4
2	10
3	28
4	46
5	88
6	126
7	219
8	303
9	429
10	531
11	717
12	897
13	1221
14	1419
15	1761
16	2019
17	2559
18	2993
19	3539
20	3941
21	4697
22	5285
23	6257
24	6835
25	7777
26	8455
27	9787
28	10735
29	12001
30	12973
31	14569
32	15871
33	17851
34	19111
35	20953
36	22251
37	24735
38	26577
39	28863
40	30465
41	33078
42	35202
43	38736

[1, 4, 10, 28, 46, 88, 126, 219, 303, 429, 531, 717, 897, 1221, 1419, 1761, 2019, 2559, 2993, 3539, 3941, 4697, 5285, 6257, 6835, 7777, 8455, 9787, 10735, 12001, 12973, 14569, 15871, 17851, 19111, 20953, 22251, 24735, 26577, 28863, 30465, 33078, 35202, 38736]

cp's OEIS Frontend

A333172 a(n) = Sum_{k=0..n} sigma(k^2 + 1), where sigma(k) is the sum of divisors of k (A000203).

Table of values

List of values