A143272 - cp's OEIS frontend

A143272 a(n) = d(n)*T(n), where d(n) is the number of divisors of n (A000005) and T(n)=n(n+1)/2 are the triangular numbers (A000217).

n	a(n)
1	1
2	6
3	12
4	30
5	30
6	84
7	56
8	144
9	135
10	220
11	132
12	468
13	182
14	420
15	480
16	680
17	306
18	1026
19	380
20	1260
21	924
22	1012
23	552
24	2400
25	975
26	1404
27	1512
28	2436
29	870
30	3720
31	992
32	3168
33	2244
34	2380
35	2520
36	5994
37	1406
38	2964
39	3120
40	6560
41	1722
42	7224
43	1892
44	5940
45	6210
46	4324
47	2256
48	11760

[1, 6, 12, 30, 30, 84, 56, 144, 135, 220, 132, 468, 182, 420, 480, 680, 306, 1026, 380, 1260, 924, 1012, 552, 2400, 975, 1404, 1512, 2436, 870, 3720, 992, 3168, 2244, 2380, 2520, 5994, 1406, 2964, 3120, 6560, 1722, 7224, 1892, 5940, 6210, 4324, 2256, 11760]

cp's OEIS Frontend

A143272 a(n) = d(n)*T(n), where d(n) is the number of divisors of n (A000005) and T(n)=n(n+1)/2 are the triangular numbers (A000217).

Table of values

List of values