A144486 - cp's OEIS frontend

A144486 Triangular numbers n*(n+1)/2 with n and n+1 composite, where number of prime factors in n = number of prime factors in n+1. (Prime factors are counted with multiplicity.)

n	a(n)
1	45
2	105
3	231
4	325
5	378
6	561
7	595
8	741
9	990
10	1653
11	2850
12	3655
13	3741
14	4371
15	4465
16	4851
17	6786
18	7021
19	7381
20	7503
21	7750
22	8911
23	9180
24	10011
25	10153
26	10585
27	10878
28	11781
29	12561
30	13530
31	14535
32	14706
33	15225
34	15753
35	20301
36	20503
37	21115
38	22791
39	23005
40	23653

[45, 105, 231, 325, 378, 561, 595, 741, 990, 1653, 2850, 3655, 3741, 4371, 4465, 4851, 6786, 7021, 7381, 7503, 7750, 8911, 9180, 10011, 10153, 10585, 10878, 11781, 12561, 13530, 14535, 14706, 15225, 15753, 20301, 20503, 21115, 22791, 23005, 23653]

cp's OEIS Frontend

A144486 Triangular numbers n*(n+1)/2 with n and n+1 composite, where number of prime factors in n = number of prime factors in n+1. (Prime factors are counted with multiplicity.)

Table of values

List of values