A156120 First of a prime pair formed by concatenating n with n-1, and a matching prime (not shown) formed by concatenating n-2 with n-3.

2423, 102101, 114113, 210209, 264263, 270269, 330329, 342341, 414413, 762761, 774773, 840839, 852851, 912911, 10021001, 11101109, 17641763, 20222021, 21302129, 22322231, 26822681, 27242723, 28322831, 32523251, 36723671

Offset

1,1

Links

Table of n, a(n) for n=1..25.

Example

Example: 2423 and matching prime 2221 (not shown), where n = 24.

Crossrefs

Sequence in context: A254901 A254908 A257203 * A078868 A340433 A340899

Adjacent sequences: A156117 A156118 A156119 * A156121 A156122 A156123

Keyword

nonn,base

Author

Ki Punches, Feb 16 2009

Extensions

Edited and extended by Ray Chandler, Feb 20 2009

Status

approved