A115887 - cp's OEIS frontend

A115887 Triangular numbers equal to the difference between a prime number and its index.

n	a(n)
1	1
2	3
3	6
4	10
5	28
6	105
7	120
8	153
9	231
10	465
11	496
12	1081
13	1378
14	1485
15	1653
16	1711
17	2628
18	3003
19	3081
20	3160
21	4950
22	5050
23	5460
24	6670
25	6903
26	8001
27	8778
28	10296
29	11781
30	14028
31	15225
32	16290
33	19701
34	20503
35	21528
36	21945
37	22155
38	24310
39	24531
40	25200
41	27495

[1, 3, 6, 10, 28, 105, 120, 153, 231, 465, 496, 1081, 1378, 1485, 1653, 1711, 2628, 3003, 3081, 3160, 4950, 5050, 5460, 6670, 6903, 8001, 8778, 10296, 11781, 14028, 15225, 16290, 19701, 20503, 21528, 21945, 22155, 24310, 24531, 25200, 27495]

cp's OEIS Frontend

A115887 Triangular numbers equal to the difference between a prime number and its index.

Table of values

List of values