5867
This number is a prime.
5867 divides the concatenation of a prime p and p+1 (i.e., 211 and 212 -> 211212) a perfect square number of times. Are there other primes like 5867? [Leonardis]
The smallest 4-digit prime consisting of the largest possible tetrad of successive digits, i.e., 5, 6, 7, 8. [Loungrides]
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