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  1. or download this
    U64 gcm4( U64 max, U64 n ) {
    U64 c, lcm;
...
    lcm = n * 4096;
    return ( max / lcm ) * lcm;
}
  2. or download this
    anonyM:  gcm for s=2147483648 & r=1 to 1073741824 took:33.850345514550
+  ### original
anonyM: gcm4 for s=2147483648 & r=1 to 1073741824 took:33.590549831120
+  ### my tweak