A115904 - cp's OEIS frontend

A115904 Numbers k such that k + sigma(k) is a triangular number.

n	a(n)
1	7
2	10
3	66
4	136
5	145
6	196
7	198
8	234
9	270
10	438
11	495
12	528
13	592
14	606
15	855
16	910
17	1045
18	1158
19	1428
20	2208
21	2718
22	2922
23	3016
24	3663
25	3808
26	3916
27	4506
28	4975
29	5043
30	5136
31	5598
32	6366
33	6600
34	7080
35	7498
36	7821
37	8172
38	8200
39	8217
40	8814
41	9318
42	9730
43	9738

[7, 10, 66, 136, 145, 196, 198, 234, 270, 438, 495, 528, 592, 606, 855, 910, 1045, 1158, 1428, 2208, 2718, 2922, 3016, 3663, 3808, 3916, 4506, 4975, 5043, 5136, 5598, 6366, 6600, 7080, 7498, 7821, 8172, 8200, 8217, 8814, 9318, 9730, 9738]

cp's OEIS Frontend

A115904 Numbers k such that k + sigma(k) is a triangular number.

Table of values

List of values