A175631 - cp's OEIS frontend

A175631 a(n) = (n-th pentagonal number) modulo (n-th triangular number).

n	a(n)
1	0
2	2
3	0
4	2
5	5
6	9
7	14
8	20
9	27
10	35
11	44
12	54
13	65
14	77
15	90
16	104
17	119
18	135
19	152
20	170
21	189
22	209
23	230
24	252
25	275
26	299
27	324
28	350
29	377
30	405
31	434
32	464
33	495
34	527
35	560
36	594
37	629
38	665
39	702
40	740
41	779
42	819
43	860
44	902
45	945
46	989
47	1034
48	1080
49	1127
50	1175
51	1224
52	1274
53	1325
54	1377
55	1430

[0, 2, 0, 2, 5, 9, 14, 20, 27, 35, 44, 54, 65, 77, 90, 104, 119, 135, 152, 170, 189, 209, 230, 252, 275, 299, 324, 350, 377, 405, 434, 464, 495, 527, 560, 594, 629, 665, 702, 740, 779, 819, 860, 902, 945, 989, 1034, 1080, 1127, 1175, 1224, 1274, 1325, 1377, 1430]

cp's OEIS Frontend

A175631 a(n) = (n-th pentagonal number) modulo (n-th triangular number).

Table of values

List of values