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9947 — prime: four primes at the edge
9947 is prime. In our series, 9931, 9937, 9947 and 9973 are all prime! A rare cluster of primes near the end of the four-digit range — a mathematical phenomenon.
Science
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994 AD — Vikings besiege London
In 994, Danish Vikings under Olaf Tryggvason and Sweyn Forkbeard besieged London. The English paid 16,000 pounds of silver as Danegeld.
History
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29→2: through the star to partnership
9+9+4+7=29→2. Through stellar 29 to two-partnership. The wisdom of two nines opens the path to union with another.
Numerology