|
| |
|
|
A068682
|
|
Numbers n such that the concatenations n, n-2, n and n, n+2, n are primes.
|
|
0
| |
|
|
3, 7, 17, 31, 49, 57, 111, 169, 269, 363, 389, 393, 637, 643, 671, 697, 787, 851, 853, 927, 1033, 1087, 1089, 1151, 1153, 1173, 1217, 1219, 1233, 1261, 1331, 1479, 1671, 1761, 1767, 1837, 1841, 1859, 1921, 2011, 2147, 2149, 2283, 2311, 2353, 2377, 2409
(list; graph; refs; listen; history; internal format)
|
| |
| |
|
|
