A375420 - cp's OEIS frontend

A375420 a(n) is the number of straight lines passing through the points (i, prime(i)) and (j, prime(j)) with i < j <= n (where prime(k) denotes the k-th prime number).

n	a(n)
1	0
2	1
3	3
4	4
5	8
6	13
7	17
8	20
9	25
10	32
11	40
12	48
13	56
14	66
15	74
16	84
17	94
18	105
19	120
20	135
21	148
22	162
23	176
24	191
25	211
26	230
27	247
28	267
29	287
30	306
31	333
32	361
33	385
34	410
35	437
36	462
37	488
38	517
39	545
40	571
41	601
42	633
43	663
44	696
45	730
46	761
47	796
48	836
49	879
50	921
51	962
52	1000
53	1038
54	1080
55	1122

[0, 1, 3, 4, 8, 13, 17, 20, 25, 32, 40, 48, 56, 66, 74, 84, 94, 105, 120, 135, 148, 162, 176, 191, 211, 230, 247, 267, 287, 306, 333, 361, 385, 410, 437, 462, 488, 517, 545, 571, 601, 633, 663, 696, 730, 761, 796, 836, 879, 921, 962, 1000, 1038, 1080, 1122]

cp's OEIS Frontend

A375420 a(n) is the number of straight lines passing through the points (i, prime(i)) and (j, prime(j)) with i < j <= n (where prime(k) denotes the k-th prime number).

Table of values

List of values