A242454 - cp's OEIS frontend

A242454 Triangular numbers T such that sum of digits of T is semiprime.

n	a(n)
1	6
2	15
3	28
4	36
5	45
6	55
7	78
8	91
9	105
10	136
11	153
12	171
13	190
14	231
15	253
16	276
17	325
18	351
19	406
20	465
21	528
22	630
23	703
24	780
25	820
26	861
27	1035
28	1081
29	1176
30	1225
31	1275
32	1431
33	1540
34	1596
35	1653
36	1711
37	1770
38	2016
39	2080
40	2211
41	2346
42	2701
43	2775
44	2850
45	3003
46	3160
47	3240
48	3321
49	3403

[6, 15, 28, 36, 45, 55, 78, 91, 105, 136, 153, 171, 190, 231, 253, 276, 325, 351, 406, 465, 528, 630, 703, 780, 820, 861, 1035, 1081, 1176, 1225, 1275, 1431, 1540, 1596, 1653, 1711, 1770, 2016, 2080, 2211, 2346, 2701, 2775, 2850, 3003, 3160, 3240, 3321, 3403]

cp's OEIS Frontend

A242454 Triangular numbers T such that sum of digits of T is semiprime.

Table of values

List of values