Semiprime
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A semiprime is the product of two (possibly equal) prime numbers.
Other names for a "semiprime" are biprime, 2-almost prime, and pq-number.
Encryption algorithms, including RSA encryption, typically rely on special large semiprimes. A table of such semiprimes is listed at MathWorld semiprime.
External Links
- Semiprimes at the OEIS