Q.

The number of divisors of the form 4n + 1, 

n0 of the number is 101011111313 is

 

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a

840

b

1024

c

924

d

750

answer is C.

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Detailed Solution

21051011111313 has a divisor of the form 

2α5β11ı13δ where 

α=0,1,2,,10,β=0,1,2,,10,γ=0,1,2,,11,δ=0,1,2,,13

It is of the form 4n+1 if α=0;β=0,1,2,,10

γ=0,2,4,,10;δ=0,1,2,,13

The desired number is 11×6×14=924

 

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