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A052089 Primes formed by concatenating n with n-1. +0
11
43, 109, 2221, 2423, 3433, 4241, 5857, 7069, 7877, 8887, 10099, 102101, 108107, 112111, 114113, 124123, 148147, 154153, 160159, 172171, 180179, 192191, 198197, 202201, 208207, 210209, 214213, 238237, 244243, 262261, 264263, 268267, 270269 (list; graph; listen)
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Last modified December 9 18:50 EST 2009. Contains 170568 sequences.


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