The sum of all natural numbers less than 101 which are co-prime to 2, 3 and 5??

The sum of all co-primes below a given number = E(n)*N/2.
Here E(N) is Euler's Totient Function for that number. So total numbers below 100 which are coprime to 2,3 and 5 is given by
100*1*2*4/(2*3*5) = 20*8/6 = 160/6
So sum of all these numbers = 100*160/12 = 1333