Finding all prime numbers before limit . These numbers are used to find prime factors .
sieveSundaram ( ) ; Console . WriteLine ( " Printing ▁ first ▁ few ▁ Equidigital ▁ Numbers ▁ using ▁ isEquidigital ( ) " ) ; for ( int i = 1 ; i < 20 ; i ++ ) if ( isEquidigital ( i ) ) Console . Write ( i + " ▁ " ) ; } }