199.

1. a) On
2. b) On
3. c) Ei
4. d) Ei
5. e) On
6. f) On

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200.

2, 3, 5, 7, 11, 13,17, 19, 22 ja 23.

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201.

47, 53, 59, 61, 67, 71, 73, 79, 83, 101

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202.

a)2·66

b)4·33

c)6·22

d)11·12

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203.

1. a) 3
2. b) 6
3. c) 9

1. d) 7
2. e) 4
3. f) 11

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204.

a)

Luku Tekijät

6 1, 2 ,3, 6

8 1, 2, 4, 8

b)

Luku Tekijät

10 1, 2, 5, 10

20 1, 2, 4, 5, 10,20

c)

Luku Tekijät

9 1, 3, 9

12 1, 2, 3, 4, 6, 12

24 1, 2, 3, 4, 6, 8,12, 24

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205.

1. a) 1, 2, 3, 6, 9 18
2. b) 1, 2, 4, 5, 20, 25, 50, 100
3. c) 1, 29
4. d) 1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 36, 48,72,144
5. e) 1, 3, 7, 9, 21, 63

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206.

1. a) 1, 2, 4, 8
2. b) 1, 2, 3, 4, 6, 12
3. c) 1, 2, 4

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207.

1. a) 12
2. b) 675
3. c) 315
4. d) 210

_______________________________________________________

208.

1. a) on alkuluku

b)2·5

c) on alkuluku

d)3·7

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209.

a)2·2·3

b)2·3·3

c)2·2·5

d)2·2·2·3

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210.

Luvut ovat alkulukuja.

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211.

4, 6, 8, 9, 18

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212.

1, 2, 3, 4, 6, 9, 12, 18, 27, 36,54, 108

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213.

a)2·2·2·5

b)2·3·3·5

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214.

1. a) 2
2. b) 2, 3, 5, 7, 11, 13, 17, 19
3. c) 29, 31, 37

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215.

a)2·3

b)3·5

c)2·2·2·3

d)2·5·5

e)2·2·5·5
_______________________________________________________

216.

127, 131, 137, 139

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217.

1. a) ei
2. b) kyllä
3. c) kyllä

_______________________________________________________

218.

2, 3, 4, 6, 8, 12 tai 24 vierasta

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219.

1. a) 11
2. b) 1089

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220.

2 3 5 7 11 2 2 2   

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221.

235711131719

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222.

1. a) 13 + 3
2. b) 23 + 23
3. c) 37 + 43
4. d) 97 + 3

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