A213005 - cp's OEIS frontend

A213005 a(0)=1, a(n) = least k > a(n-1) such that k*a(n-1) is a triangular number.

n	a(n)
0	1
1	3
2	5
3	9
4	17
5	33
6	45
7	72
8	143
9	152
10	303
11	420
12	451
13	603
14	952
15	1398
16	1572
17	2408
18	3762
19	4233
20	5880
21	6325
22	8469
23	13384
24	20079
25	34189
26	62769
27	82665
28	87448
29	161037
30	287283
31	371337
32	515745
33	533505
34	573815
35	734484
36	737035
37	737149
38	767505
39	825495
40	887865
41	1136468
42	2272935

[1, 3, 5, 9, 17, 33, 45, 72, 143, 152, 303, 420, 451, 603, 952, 1398, 1572, 2408, 3762, 4233, 5880, 6325, 8469, 13384, 20079, 34189, 62769, 82665, 87448, 161037, 287283, 371337, 515745, 533505, 573815, 734484, 737035, 737149, 767505, 825495, 887865, 1136468, 2272935]

cp's OEIS Frontend

A213005 a(0)=1, a(n) = least k > a(n-1) such that k*a(n-1) is a triangular number.

Table of values

List of values