A103289 - cp's OEIS frontend

A103289 Numbers k such that both sigma(k) >= 2k-1 and sigma(k+1) >= 2(k+1)-1.

n	a(n)
1	1
2	4095
3	5775
4	5984
5	7424
6	11024
7	21735
8	21944
9	26144
10	27404
11	39375
12	43064
13	49664
14	56924
15	58695
16	61424
17	69615
18	70784
19	76544
20	77175
21	79695
22	81080
23	81675
24	82004
25	84524
26	84644
27	89775
28	91664
29	98175
30	103455
31	104895
32	106784
33	109395
34	111824

[1, 4095, 5775, 5984, 7424, 11024, 21735, 21944, 26144, 27404, 39375, 43064, 49664, 56924, 58695, 61424, 69615, 70784, 76544, 77175, 79695, 81080, 81675, 82004, 84524, 84644, 89775, 91664, 98175, 103455, 104895, 106784, 109395, 111824]

cp's OEIS Frontend

A103289 Numbers k such that both sigma(k) >= 2k-1 and sigma(k+1) >= 2(k+1)-1.

Table of values

List of values

cp's OEIS Frontend

A103289 Numbers k such that both sigma(k) >= 2*k-1 and sigma(k+1) >= 2*(k+1)-1.

Table of values

List of values

A103289 Numbers k such that both sigma(k) >= 2k-1 and sigma(k+1) >= 2(k+1)-1.