A214961 - cp's OEIS frontend

A214961 a(0)=a(1)=1, a(n) = least k > a(n-1) such that k*a(n-2) is a triangular number.

n	a(n)
0	1
1	1
2	3
3	6
4	7
5	11
6	13
7	21
8	25
9	30
10	49
11	59
12	97
13	117
14	193
15	233
16	385
17	465
18	492
19	596
20	983
21	1191
22	1965
23	2381
24	2516
25	4761
26	5031
27	5761
28	6290
29	8466
30	9795
31	15470
32	15867
33	17403
34	20559
35	24170
36	26945
37	27192
38	27755
39	30130
40	35235
41	43537
42	45100
43	56805
44	58717
45	58739
46	91000
47	117477

[1, 1, 3, 6, 7, 11, 13, 21, 25, 30, 49, 59, 97, 117, 193, 233, 385, 465, 492, 596, 983, 1191, 1965, 2381, 2516, 4761, 5031, 5761, 6290, 8466, 9795, 15470, 15867, 17403, 20559, 24170, 26945, 27192, 27755, 30130, 35235, 43537, 45100, 56805, 58717, 58739, 91000, 117477]

cp's OEIS Frontend

A214961 a(0)=a(1)=1, a(n) = least k > a(n-1) such that k*a(n-2) is a triangular number.

Table of values

List of values