2的次方对照表

作用：倍增长度对照

重要：

2^19≈5*10^5

2^20≈1*10^6

2^21≈2*10^6

2^0 = 1

2^1 = 2

2^2 = 4

2^3 = 8

2^4 = 16

2^5 = 32

2^6 = 64

2^7 = 128

2^8 = 256

2^9 = 512

2^10 = 1024

2^11 = 2048

2^12 = 4096

2^13 = 8192

2^14 = 16384

2^15 = 32768

2^16 = 65536

2^17 = 131072

2^18 = 262144

2^19 = 524288

2^20 = 1048576

2^21 = 2097152

2^22 = 4194304

2^23 = 8388608

2^24 = 16777216

2^25 = 33554432

2^26 = 67108864

2^27 = 134217728

2^28 = 268435456

2^29 = 536870912

2^30 = 1073741824

2^31 = 2147483648

2^32 = 4294967296

2^33 = 8589934592

2^34 = 17179869184

2^35 = 34359738368

2^36 = 68719476736

2^37 = 137438953472

2^38 = 274877906944

2^39 = 549755813888

2^40 = 1099511627776

2^41 = 2199023255552

2^42 = 4398046511104

2^43 = 8796093022208

2^44 = 17592186044416

2^45 = 35184372088832

2^46 = 70368744177664

2^47 = 140737488355328

2^48 = 281474976710656

2^49 = 562949953421312

2^50 = 1125899906842624

2^51 = 2251799813685248

2^52 = 4503599627370496

2^53 = 9007199254740992

2^54 = 18014398509481984

2^55 = 36028797018963968

2^56 = 72057594037927936

2^57 = 144115188075855872

2^58 = 288230376151711744

2^59 = 576460752303423488

2^60 = 1152921504606846976

2^61 = 2305843009213693952

2^62 = 4611686018427387904

2^63 = 9223372036854775808

2^64 = 18446744073709551616