wolfgang Posted January 2, 2012 Report Share Posted January 2, 2012 Try to find the missing number :- 10,31,59,97,.........,173 please give your reason....thanks. Quote Link to comment Share on other sites More sharing options...
0 superprismatic Posted January 2, 2012 Report Share Posted January 2, 2012 131 Call the sequence S. Then S(1)=10, S(2)=31,... It appears that S(n) is the sum of the (3n)th prime, the (3n-1)th prime, and the (3n-2)th prime. So, S(5) is the sum of the 15th prime, the 14th prime, and the 13th prime (47+43+41), which is 131. Quote Link to comment Share on other sites More sharing options...
0 Guest Posted January 2, 2012 Report Share Posted January 2, 2012 Try to find the missing number :- 10,31,59,97,.........,173 please give your reason....thanks. 160, progression of the differences between the numbers Quote Link to comment Share on other sites More sharing options...
0 wolfgang Posted January 2, 2012 Author Report Share Posted January 2, 2012 131 Call the sequence S. Then S(1)=10, S(2)=31,... It appears that S(n) is the sum of the (3n)th prime, the (3n-1)th prime, and the (3n-2)th prime. So, S(5) is the sum of the 15th prime, the 14th prime, and the 13th prime (47+43+41), which is 131. Thats it...Very good! Quote Link to comment Share on other sites More sharing options...
0 Guest Posted January 6, 2012 Report Share Posted January 6, 2012 Dam, why has everyone answered it already? Quote Link to comment Share on other sites More sharing options...
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wolfgang
Try to find the missing number :-
10,31,59,97,.........,173
please give your reason....thanks.
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