BigInt Prime number generator and primness checker

This can operate in three ways:
1: You can enter a number in the lowe most input field, and check if it is a prime number or not.
The test done is the Miller-Rabin primality test looped 33 times.
The risk for a false positive is in the order of 1/4 ³³ or one in about 7·10¹⁹.
For small numbers (<9·10¹⁵) it will also do an exact test. This may
take a few seconds.
2: This will first generate a random integer with the required number
of decimal digits. It will then be turned to the form 6n-1. Then that number,
the number +2, then +4, then +2 and so will be tested until prime number is reached.
If the search takes too long, click enter again.

Required number of digits: Enter

3: This does the same, but it generates a random integer with the required number of bits.

Number of bits: Enter

The prime number Check Next prime Save to p Save to q