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Single Curio View: (Seek other curios for this number) The 13th case of a prime concatenation of the form n & nth prime is with n = 42 and nth prime = 181 (42181). Coincidentally 181 is congruent to 13 modulo 42. Note that 18142181 is also prime. Furthermore the operations 181  42 and 42 + 181 yield primes resp. 139 and 223 leading us to these prime combinations with 42 in the middle : 13942223 (A) and 22342139 (B). Finally (B)(A) = 2234213913942223 is prime as well. [De Geest]
Submitted: 20020225 09:21:32; Last Modified: 20080130 11:28:00.
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