1) It is an example of exponential growth.
2) 128 64 32 16 8 4 2 1, is used by networkers to find IP address classes and custom subnet masks.
IP address classes A-E
128 64 32 16 8 4 2 1
A 0 0 0 0 0 0 0 0 = 0 through 127 (0+0+0+0+0+0+0+0=0)
B 1 0 0 0 0 0 0 0 = 128 through 191 (128+0+0+0+0+0+0+0=128)
C 1 1 0 0 0 0 0 0 = 192 through 223 (128+64+0+0+0+0+0+0=192)
D 1 1 1 0 0 0 0 0 = 224 through 239 (128+64+32+0+0+0+0+0=224)
E 1 1 1 1 0 0 0 0 = 240 through 255 (128+64+32+16+0+0+0+0=240)
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1, 2, 4, 8, 16, 32, 64 4, 8, 16, 32, 64 are composite. 2 is prime. 1 is neither.
1, 2, 4, 8, 16, 32, 64
1, 2, 4, 8, 16, 32, 64
1, 2, 4, 8, 16, 32, 64: 1 x 64, 2 x 32, 4 x 16, 8 x 8.
The Factors of 64 are 1, 2, 4, 8, 16, 32 and 64.