Keith P.

asked • 02/02/17

find the missing number 2, 9, 20, 37, 64, 107, ?

find the missing number, im coming up with 176....

1 Expert Answer

By:

Kenneth S. answered • 02/02/17

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4.8 (62)

Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018

Mark M.

Ingenious!
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02/02/17

Norbert J. M.

tutor
Recognize the difference in consecutive numbers listed
results in a prime number.  Find the pattern between
the prime number differences....
 
-The pattern consists of adding consecutive primes (7,11) to
           consecutive numbers (2,9).  
-Skip one prime (13), next prime 17 added to 20.  
-Skip next two primes (19,23), next prime 27 added to 37.  
-Skip next three primes (29,31,37), next prime 43 added to 64.  
-Following the pattern above, then skip next four primes (47,53,59,61)
            next prime 67 added to 107, resulting in 174...Kenneth's exact result!
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02/03/17

Mihai K.

Are you people in your right mind? Since when 27 is a prime number? Even if it was this whole algorithm is ridiculous, this is not something one can solve in a few seconds or minutes without pen and paper!
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03/30/17

Kenneth S.

To  Mihai from Santiago, MN
 
Your comment "are you people in your right mind" is inappropos because I believe that you only have a quarrel with Norbert.
 
My solution of Feb. 2 stands, and it makes no mention of prime numbers whatsoever.
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03/30/17

Gary V.

My answer is 176 and does not require a table. Sum the differences and subtract 1. (7+11)-1 = 17, (11+17)-1 = 27, (17+27)-1 = 43, (27+43) - 1 = 69. 107+69 = 176
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08/07/19

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