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Family Day update

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Ingy döt Net 2020-02-17 23:21:07 -08:00
parent aac6731f2c
commit 9ad63ea473
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Task/Multiplicative-order/Factor/multiplicative-order.factor Normal file
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USING: kernel math math.functions math.primes.factors sequences ;
: (ord) ( a pair -- n )
first2 dupd ^ swap dupd [ /i ] keep 1 - * divisors
[ swap ^mod 1 = ] 2with find nip ;
: ord ( a n -- m )
2dup gcd nip 1 =
[ group-factors [ (ord) ] with [ lcm ] map-reduce ]
[ 2drop 0/0. ] if ;