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| Carla Kik © 2004 |
The last two digits of Jack Reacher's ATM card PIN in the novel
Bad Luck and Trouble by Lee Child. Reacher liked 97 because it is the largest two-digit prime number. [Reynolds]
The smallest odd non-cluster prime. An odd prime p is called
a cluster prime if every even positive integer less than p-2 can be
written as the difference of two primes q - q', where q, q' is less than or equal to p.
The number formed by the concatenation of odd numbers from one to 97 is prime. [Howell]
There are 97 leap days every four hundred years in the Gregorian calendar. [Poo Sung]
Physiology is reduced to the economic needs of locomotion at the prime number tempo of 97 beats per minute. [Hayes-Marshall]
The smallest prime comparable to all minimal primes in base 3. [Rupinski]
The largest non-titanic prime which can be expressed as the sum of equal powers of two consecutive primes (i.e., 2^4 + 3^4). [Gupta]
There are 97 chapters, some as short as a paragraph or two, in Bruce Chatwin's book In Patagonia, giving the entire book a vignette-like feel. [Deemikay]
Shakespeare's Sonnet XCVII (97) has a curious property. The seventh word of the seventh line of the sonnet is "prime." [Keith]
97, 907, 9007, 90007 and 900007 are all primes, but 9000007, 90000007, 900000007, 9000000007, and 90000000007 are all composites.
The smallest prime which is the sum of a prime number of
consecutive primes as well as the sum of a composite number
of consecutive composite numbers: 97 = 29 + 31 + 37 = 22 +
24 + 25 + 26. [Beedassy]
The continued fraction for  to the fourth power starts with 97.
The first four pairs of digits following the decimal point of 1/97 are powers of three: 1/97 = 0.01030927.... [Hill]
The first ever NASCAR win for Plymouth and the Chrysler Corporation was powered by a strictly stock flathead engine that produced 97 horsepower.
Generally, one jigger (one and a half ounces) of liquor (gin, rum, vodka, and whiskey) contains 97 calories. [Larsen]
The largest two-digit prime whose cube is zeroless. [Pattterson]
97 = ((9)^(9) + (7)^(7)). Note that the prime
97 is the only integer with this property. [Firoozbakht]
The largest known prime p with the property that when
writing down all the natural numbers from 0 to p one uses p
odd digits. [Capelle]
The word NINETYSEVEN contains smoothly undulating constants
and vowels. Is there a larger example? [Johnson]
In the middle of 97 insert (97 - 1) and you get 9967, which is
also prime. Put (97 - 1) in the middle of 9967 and you get
999667, which is another prime. Put (97 - 1) in the middle again
and you get 99996667, yet another prime. After inserting
(97 - 1) in the middle once more, it is left for the prime curiologist to
find the factors of 9999966667. [Honaker]
97 = 4! * 4 + 4/4. [Dunn]
There are 97 non-cubic 3-dimensional crystallographic groups without reflection planes. [Post]
Vernon Dalhart's version of the "Wreck of Old 97" is sometimes cited as the American music industry's first million-seller.
The number of primes with exactly 3 distinct digits. [Beedassy]
The only prime (emirp) that can be expressed as the sum of
fourth powers of two consecutive primes (2^4+3^4). [Loungrides]
97 and its double (194) and triple (291) use the same
number of characters (five) when expressed in Roman
numerals: XCVII, CXCIV, and CCXCI. [Meller]
The smallest prime that can be expressed as the sum of first odd composite numbers (9 + 15 + 21 + 25 + 27). [Silva]
Dudeney numbers are exactly 13, 83,
173, 183, 263,
273. The sum 97 = 1 + 8 + 17 + 18 + 26 + 27 is
an emirp. [Poo Sung]
The only nonagenarian prime. British logician, mathematician, and philosopher Bertrand Russell lived to be 97.
The number of ways to form two fractions that add up to 1 if all distinct digits 0 through 9 are used in each case. There is only one such case that uses the number 97. Can you find it?
The sum of all prime factorials less than or equal to 97 is prime after subtracting 1. [Silva]
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