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101   $aeng
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200 1 $aUnsolved problems in number theory$fRichard K. Guy
205   $a2 ed.
210   $aNew York$cSpringer$dc1994
215   $aXVI, 285 p.$d24 cm
225 2 $aProblem books in mathematics$v1
410   $12001$aProblem books in mathematics$v1
606   $aTeoria dei numeri
676   $a512.7
700  1$aGUY,$bRichard K.$047477
801  0$aIT$bsalbc$gISBD
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996   $aUnsolved problems in number theory$981813
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