The smallest prime of the form 10p - 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]
"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]
The sum of digits of the largest 3-digit prime (997) provides the number prime less than or equal to the largest 2-digit prime (97). This is not true for any other tier of n-digit numbers. [Green]
The smallest prime whose sum of digits is an odd composite
number. [Loungrides]
(There are 2 curios for this number that have not yet been approved by an editor.)
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