15709
This number is a composite.
The smallest and only known non-palindromic pseudoprime(base-2) whose reversal (i.e., 90751) is also a pseudoprime(base-2). [Gupta]
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This number is a composite.
The smallest and only known non-palindromic pseudoprime(base-2) whose reversal (i.e., 90751) is also a pseudoprime(base-2). [Gupta]