Prime Curios!: 443

443
(another Prime Pages' Curiosity)

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443 is the 24th (half of 4 * 4 * 3) Sophie Germain prime, since 443*2+1 = 887 which is also is prime (and 8 + 8 + 7 is the successor to 24). [Carmichael]

Submitted: 2004-10-25 05:50:50; Last Modified: 2008-01-30 11:28:00.