Number of divisors of the form 4n + 2(n >= 0) of the integer 240

Number of divisors of the form 4n 2n geq 0 of the integ... | Permutations and Combinations (Mathematics)

(a)

: 240=2^4 \cdot 3 \cdot 5 \\

Divisors of 240 are

1,2,4,8,16,

3,6,12,24,48,

5,10,20,40,80,

15,30,60,120,240

From these divisors just 4 divisors

2,6,10,30

are of the form

4 n+2