A292064 - cp's OEIS frontend

A292064 Triangular numbers k such that psi(k) is a square, where psi(k) is the Dedekind psi function (A001615).

n	a(n)
1	1
2	3
3	66
4	210
5	276
6	1128
7	2346
8	2556
9	4278
10	5778
11	7140
12	7750
13	7875
14	11781
15	13041
16	18336
17	22578
18	27966
19	28920
20	31878
21	32131
22	32640
23	35511
24	51681
25	70125
26	73536
27	79800
28	89676
29	93096
30	100128
31	102378
32	122760
33	139128
34	169653
35	173755
36	177906
37	209628
38	223446
39	253116

[1, 3, 66, 210, 276, 1128, 2346, 2556, 4278, 5778, 7140, 7750, 7875, 11781, 13041, 18336, 22578, 27966, 28920, 31878, 32131, 32640, 35511, 51681, 70125, 73536, 79800, 89676, 93096, 100128, 102378, 122760, 139128, 169653, 173755, 177906, 209628, 223446, 253116]

cp's OEIS Frontend

A292064 Triangular numbers k such that psi(k) is a square, where psi(k) is the Dedekind psi function (A001615).

Table of values

List of values