The two largest known twin primes are . with 11713 digits, found by Indlekofer and Ja'rai in November, 1995. They are also the first known gigantic twin primes (primes with at least 10,000 digits).

Recent record holders are:

- , with 5129 digits, by Harvey Dubner.
- , with 4932 digits, found by Indlekofer and Ja'rai in 1994.
- with 4030 digits, found by H. Dubner.
- . Found by H. Dubner as well.

The two largest Sophie Germain primes (i.e. *p* and 2*p*+1 are both primes)
are and *q*=2*p* + 1, found by Harvey
Dubner, in October 3, 1995.

**References**

*B. K. Parady and J. F. Smith and S. E. Zarantonello,
Smith, Noll and Brown.* **
Largest known twin primes.** *Mathematics of Computation,*
vol.55, 1990, pp. 381-382.

Mon Feb 23 16:26:48 EST 1998