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Delete any digit of 3137 and it will remain prime. [Blanchette] The smallest fourdigit prime that is comprised of two consecutive primes concatenated. [Patterson] The largest prime such that each substring is a prime or 1. [Capelle] 3137 is the sum of 31 consecutive primes whose first two are 31 and 37. [Silva] The only prime of form n^2+1 concatenated from two consecutive doubledigit primes, i.e., 3137=56^2+1. [Loungrides] The smallest of only three righttruncatable primes formed by concatenating two doubledigit emirps. The other are 3797 and 7331. [Loungrides]
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