A191219 - cp's OEIS frontend

A191219 Positive integers k such that n=k(2k-1) satisfies: sigma(n) congruent to 2 modulo 4.

n	a(n)
1	5
2	9
3	13
4	41
5	49
6	61
7	113
8	121
9	169
10	181
11	225
12	289
13	313
14	421
15	441
16	613
17	625
18	761
19	925
20	1013
21	1201
22	1301
23	1521
24	1681
25	1741
26	1849
27	1861
28	2025
29	2113
30	2381
31	2401
32	2521
33	3121
34	3481
35	3613
36	3969
37	4325
38	4513
39	4761
40	4901

[5, 9, 13, 41, 49, 61, 113, 121, 169, 181, 225, 289, 313, 421, 441, 613, 625, 761, 925, 1013, 1201, 1301, 1521, 1681, 1741, 1849, 1861, 2025, 2113, 2381, 2401, 2521, 3121, 3481, 3613, 3969, 4325, 4513, 4761, 4901]

cp's OEIS Frontend

A191219 Positive integers k such that n=k(2k-1) satisfies: sigma(n) congruent to 2 modulo 4.

Table of values

List of values

cp's OEIS Frontend

A191219 Positive integers k such that n=k*(2*k-1) satisfies: sigma(n) congruent to 2 modulo 4.

Table of values

List of values

A191219 Positive integers k such that n=k(2k-1) satisfies: sigma(n) congruent to 2 modulo 4.