A068700 - cp's OEIS frontend

A068700 The concatenation of n with n-1 and n with n+1 both yield primes (twin primes).

n	a(n)
1	42
2	78
3	102
4	108
5	180
6	192
7	270
8	300
9	312
10	330
11	342
12	390
13	420
14	522
15	540
16	612
17	660
18	822
19	840
20	882
21	1002
22	1140
23	1230
24	1272
25	1482
26	1542
27	1632
28	1770
29	2100
30	2190
31	2682
32	2742
33	3072
34	3198
35	3408
36	3642
37	3828
38	4242
39	4452
40	4572
41	4740
42	4788
43	4998
44	5622
45	5718
46	5832

[42, 78, 102, 108, 180, 192, 270, 300, 312, 330, 342, 390, 420, 522, 540, 612, 660, 822, 840, 882, 1002, 1140, 1230, 1272, 1482, 1542, 1632, 1770, 2100, 2190, 2682, 2742, 3072, 3198, 3408, 3642, 3828, 4242, 4452, 4572, 4740, 4788, 4998, 5622, 5718, 5832]

cp's OEIS Frontend

A068700 The concatenation of n with n-1 and n with n+1 both yield primes (twin primes).

Table of values

List of values