Bit's

[20:19:48] (1 << 1)=2; mask=2;

[20:19:48] (1 << 2)=4; mask=6;

[20:19:48] (1 << 3)=8; mask=14;

[20:19:48] (1 << 4)=16; mask=30;

[20:19:48] (1 << 5)=32; mask=62;

[20:19:48] (1 << 6)=64; mask=126;

[20:19:48] (1 << 7)=128; mask=254;

[20:19:48] (1 << 8)=256; mask=510;

[20:19:48] (1 << 9)=512; mask=1022;

[20:19:48] (1 << 10)=1024; mask=2046;

[20:19:48] (1 << 11)=2048; mask=4094;

[20:19:48] (1 << 12)=4096; mask=8190;

[20:19:48] (1 << 13)=8192; mask=16382;

[20:19:48] (1 << 14)=16384; mask=32766;

[20:19:48] (1 << 15)=32768; mask=65534;

[20:19:48] (1 << 16)=65536; mask=131070;

[20:19:48] (1 << 17)=131072; mask=262142;

[20:19:48] (1 << 18)=262144; mask=524286;

[20:19:48] (1 << 19)=524288; mask=1048574;

[20:19:48] (1 << 20)=1048576; mask=2097150;