A249490 - cp's OEIS frontend

A249490 a(n) = Sum_{m=0..floor((n-1)/2)} prime((n-m)(n-m-1)/2+m+1).

n	a(n)
1	2
2	3
3	12
4	28
5	63
6	113
7	208
8	296
9	473
10	657
11	946
12	1236
13	1661
14	2071
15	2688
16	3228
17	4059
18	4811
19	5898
20	6858
21	8209
22	9433
23	11116
24	12572
25	14637
26	16395
27	18872
28	21046
29	23935
30	26405
31	29836
32	32742
33	36695
34	40007
35	44480
36	48254
37	53405
38	57681
39	63488
40	68284
41	74791
42	80149
43	87374

[2, 3, 12, 28, 63, 113, 208, 296, 473, 657, 946, 1236, 1661, 2071, 2688, 3228, 4059, 4811, 5898, 6858, 8209, 9433, 11116, 12572, 14637, 16395, 18872, 21046, 23935, 26405, 29836, 32742, 36695, 40007, 44480, 48254, 53405, 57681, 63488, 68284, 74791, 80149, 87374]

cp's OEIS Frontend

A249490 a(n) = Sum_{m=0..floor((n-1)/2)} prime((n-m)(n-m-1)/2+m+1).

Table of values

List of values