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Prime Curios!: 641 (180 words) |
 | 641 divides all the Generalized Fermat numbers of the form (2^a*5^b)^2^5 + 1, where a is odd and b is even, or a is even and b is odd. |
| 641 is the smallest prime factor of 4^16 + 1, written with all the digits of 641. |
| The leading 641 digits in the decimal expansion of the square root of three is prime. |
| Review: Altec Lansing Select 641 multimedia speaker system (3584 words) |
| The 641 is the large and hairy member of the family who, later, plays the pinata game with the bully. |
| The 641 sub has the same layout, but its drivers are 6.5 inch units (well, maybe only 6 inchers, but let's be generous), and the system power rating is 200 watts RMS. |
| The Select 641 satellites didn't knock my socks off, but neither did they make plasticky resonant noises, sound as if they were trapped in a pillow case, or tizz away annoyingly at the top of their range. |
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