A061784 - cp's OEIS frontend

A061784 Number of sums prime(i) + prime(j) that occur more than once for 1 <= i <= j <= n, where prime(k) = k-th prime.

n	a(n)
1	0
2	0
3	0
4	1
5	2
6	4
7	7
8	11
9	16
10	22
11	27
12	34
13	41
14	51
15	61
16	73
17	86
18	96
19	110
20	124
21	140
22	158
23	175
24	193
25	211
26	231
27	252
28	275
29	299
30	325
31	348
32	374
33	401
34	427
35	456
36	486
37	516
38	549
39	581
40	615
41	650
42	684
43	722
44	759
45	798
46	839
47	879
48	921
49	961
50	1005
51	1048
52	1095
53	1142
54	1189
55	1238

[0, 0, 0, 1, 2, 4, 7, 11, 16, 22, 27, 34, 41, 51, 61, 73, 86, 96, 110, 124, 140, 158, 175, 193, 211, 231, 252, 275, 299, 325, 348, 374, 401, 427, 456, 486, 516, 549, 581, 615, 650, 684, 722, 759, 798, 839, 879, 921, 961, 1005, 1048, 1095, 1142, 1189, 1238]

cp's OEIS Frontend

A061784 Number of sums prime(i) + prime(j) that occur more than once for 1 <= i <= j <= n, where prime(k) = k-th prime.

Table of values

List of values