A164620 - cp's OEIS frontend

A164620 Primes p such that 1 +p*floor(p/2) is also prime.

n	a(n)
1	2
2	5
3	13
4	17
5	41
6	61
7	89
8	97
9	101
10	113
11	149
12	173
13	229
14	241
15	281
16	317
17	349
18	353
19	373
20	397
21	409
22	421
23	433
24	461
25	509
26	521
27	661
28	673
29	761
30	853
31	881
32	937
33	941
34	1013
35	1093
36	1109
37	1249
38	1289
39	1297
40	1373
41	1433
42	1549
43	1741
44	1753
45	1913
46	2113
47	2213
48	2269
49	2281
50	2297

[2, 5, 13, 17, 41, 61, 89, 97, 101, 113, 149, 173, 229, 241, 281, 317, 349, 353, 373, 397, 409, 421, 433, 461, 509, 521, 661, 673, 761, 853, 881, 937, 941, 1013, 1093, 1109, 1249, 1289, 1297, 1373, 1433, 1549, 1741, 1753, 1913, 2113, 2213, 2269, 2281, 2297]

cp's OEIS Frontend

A164620 Primes p such that 1 +p*floor(p/2) is also prime.

Table of values

List of values