A227904 - cp's OEIS frontend

A227904 Numbers k such that Sum_{j=1..k} antisigma(j) == 0 (mod sigma(k)).

n	a(n)
1	1
2	2
3	39
4	78
5	100
6	126
7	434
8	501
9	1313
10	54111
11	359466
12	523219
13	6601441
14	8034674
15	54092207
16	64149290
17	158882288
18	3016740661
19	20951813922
20	52815759197
21	120508871819

[1, 2, 39, 78, 100, 126, 434, 501, 1313, 54111, 359466, 523219, 6601441, 8034674, 54092207, 64149290, 158882288, 3016740661, 20951813922, 52815759197, 120508871819]

cp's OEIS Frontend

A227904 Numbers k such that Sum_{j=1..k} antisigma(j) == 0 (mod sigma(k)).

Table of values

List of values