A356478 - cp's OEIS frontend

A356478 a(n) is the least k such that there are exactly n primes p <= k such that 2k-p and p(2k-p)+2k are also prime.

n	a(n)
0	2
1	4
2	11
3	15
4	21
5	35
6	42
7	111
8	81
9	117
10	126
11	60
12	291
13	147
14	225
15	417
16	210
17	330
18	357
19	555
20	561
21	375
22	315
23	477
24	735
25	552
26	420
27	975
28	630
29	585
30	816
31	840
32	930
33	1925
34	1302
35	1170
36	1140
37	2202
38	1215
39	1155
40	1911
41	1551
42	2031
43	1590
44	1365
45	2136
46	1425
47	2562
48	1740
49	1485
50	2331
51	2790
52	2160
53	2100
54	2640
55	2010
56	3681
57	2400
58	1785
59	2262
60	3252
61	2622
62	2940
63	1575
64	2310
65	2541
66	3987
67	2772

[2, 4, 11, 15, 21, 35, 42, 111, 81, 117, 126, 60, 291, 147, 225, 417, 210, 330, 357, 555, 561, 375, 315, 477, 735, 552, 420, 975, 630, 585, 816, 840, 930, 1925, 1302, 1170, 1140, 2202, 1215, 1155, 1911, 1551, 2031, 1590, 1365, 2136, 1425, 2562, 1740, 1485, 2331, 2790, 2160, 2100, 2640, 2010, 3681, 2400, 1785, 2262, 3252, 2622, 2940, 1575, 2310, 2541, 3987, 2772]

cp's OEIS Frontend

A356478 a(n) is the least k such that there are exactly n primes p <= k such that 2k-p and p(2k-p)+2k are also prime.

Table of values

List of values

cp's OEIS Frontend

A356478 a(n) is the least k such that there are exactly n primes p <= k such that 2*k-p and p*(2*k-p)+2*k are also prime.

Table of values

List of values

A356478 a(n) is the least k such that there are exactly n primes p <= k such that 2k-p and p(2k-p)+2k are also prime.