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2^1 = 2　　0x02        
2^2 = 4　　0x04
2^3 = 8　　0x08
2^4 = 16　　0x10　　　
2^5 = 32　　0x20
2^6 = 64　　0x40
2^7 = 128　　0x80
2^8 = 256　　0x100
2^9 = 512　　0x200
2^10 = 1024　　0x400
2^11 = 2048　　0x800
2^12 = 4096　　0x1000　　
2^13 = 8192　　0x2000
2^14 = 16384　　0x4000
2^15 = 32768　　0x8000
2^16 = 65536　　0x10000
2^17 = 131072　　0x20000
2^18 = 262144　　0x40000
2^19 = 524288　　0x80000
2^20 = 1048576　　0x100000　　
2^21 = 2097152　　0x200000
2^22 = 4194304　　0x400000
2^23 = 8388608　　0x800000　　
2^24 = 16777216　　0x1000000　　
2^25 = 33554432　　0x2000000
2^26 = 67108864　　0x4000000
2^27 = 134217728　　0x8000000
2^28 = 268435456　　0x10000000
2^29 = 536870912　　0x20000000
2^30 = 1073741824　　0x40000000　　
2^31 = 2147483648　　0x80000000
2^32 = 4294967296　　0x100000000
2^33 = 8589934592　　0x200000000
2^34 = 17179869184　　0x400000000
2^35 = 34359738368　　0x800000000　　
2^36 = 68719476736　　0x1000000000
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