A084000 a(1) = 7; then numbers such that the concatenation a(n)a(n-1)...a(2)a(1)a(2)...a(n-1)a(n) is a prime.

7, 3, 9, 17, 19, 9, 93, 29, 69, 27, 37, 33, 57, 41, 31, 167, 111, 1, 3, 267, 119, 87, 121, 671, 363, 393, 87, 241, 131, 151, 29, 21, 277, 273, 219, 119, 517, 251, 433, 93, 39, 731, 1593, 321, 579, 279, 687, 691, 629, 939, 943, 831, 513, 449, 1813, 413, 187, 947, 79

Offset: 1

Author

Amarnath Murthy, May 23 2003

Keywords

• base
• nonn

Crossrefs

Cf. A083996, A083997, A083998, A083999, A084001.

Extensions

More terms from Ray Chandler, Aug 03 2003