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4241 -> 442441
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5.0 x*x + y*y < n ( ) , , (n 1/2).
6.0 n k, n > 1. k 1/n. ( , .) .
7.0 n > 1. 1/n.
8.0 b, b > 0. b, div mod, 2 ; C1*log(a/b) + C2 C1, C2.
9.0 k- 11, 21, 31, 41, 51,
10.0 k- , , 1. 123456789 10 11 12 13
11.0 p/q (0<p<q<16) , 1.
12.0 N, 10 ( - 0). , , N ( ), N. , 315 3. : 351, 513 531.
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