A210479 - cp's OEIS frontend

A210479 Primes p with p-1 and p+1 both practical: "Sandwich of the first kind".

n	a(n)
1	3
2	5
3	7
4	17
5	19
6	29
7	31
8	41
9	79
10	89
11	127
12	197
13	199
14	271
15	307
16	379
17	449
18	461
19	463
20	521
21	701
22	727
23	811
24	859
25	881
26	919
27	929
28	967
29	991
30	1217
31	1231
32	1289
33	1301
34	1409
35	1471
36	1481
37	1483
38	1567
39	1721
40	1889
41	1951
42	1999
43	2129
44	2393
45	2441
46	2549
47	2551
48	2729
49	2753
50	2861
51	2969
52	3041
53	3079
54	3319
55	3329
56	3331
57	3499
58	3739
59	3761
60	4049

[3, 5, 7, 17, 19, 29, 31, 41, 79, 89, 127, 197, 199, 271, 307, 379, 449, 461, 463, 521, 701, 727, 811, 859, 881, 919, 929, 967, 991, 1217, 1231, 1289, 1301, 1409, 1471, 1481, 1483, 1567, 1721, 1889, 1951, 1999, 2129, 2393, 2441, 2549, 2551, 2729, 2753, 2861, 2969, 3041, 3079, 3319, 3329, 3331, 3499, 3739, 3761, 4049]

cp's OEIS Frontend

A210479 Primes p with p-1 and p+1 both practical: "Sandwich of the first kind".

Table of values

List of values