Prime Curios!: 997

997
(another Prime Pages' Curiosity)

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The smallest prime of the form 10^p - p, where p is prime. [Luhn]

The Schleicher K7 is a vintage two-seat glider with three axis controls which would remain airborne for approximately five minutes off a 997 foot winch launch in still air. [Croll]

The prime number 997 is the smallest number m such that m^k - pi(m^k) is prime for k = 1, 2 & 3. [Firoozbakht]

"Nine hundred and ninety-seven" is the largest oban (short for " 'o' banned ") prime since primes beyond it use the word "thousand(s)" and/or the suffix "-illion(s)" in their names. [Beedassy]

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