why 23 in between 21 and 25 is not lucky number,

as we are getting digit sum 5, and sum of square of digits are 13.

I believe there are no such things as unlucky numbers; it's all just nonsense. Numerology seems to be nothing more than a theory created by enthusiasts trying to link real life and numbers with mysticism. Building inspections Perth

def luckyNumbers(a, b): lucky_nums=[] seq=range(a,b+1) for num in seq: number=num sum=0 sum_sqr=0 while num!=0: remain=num%10 sum+=remain sum_sqr+=(remain**2) num=num//10

    count1=0
    for i in range(1,sum+1):
        if(sum%i==0):
            count1+=1

    count2=0
    for j in range(1,sum_sqr+1):
        if(sum_sqr%j==0):
            count2+=1
    if count1==2 and count2==2:
        lucky_nums.append(number)

return len(lucky_nums)               

Here is my solution in java, javascript, python, C, C++, Csharp HackerRank Lucky Numbers Problem Solution

Why not work for number very long in javascript?