00273nam a2200109 a 450000500170000002000150001708200150003210000190004724500340006626000440010030000190014420251203110319.0  a0486400263  a512.7bKHI  aKhinchin, A.Y.  aThree pearls of number theory  aNew YorkbDover Publications,Inc.c1998  a64p.c23cm.PB.