21 lines
596 B
Factor
21 lines
596 B
Factor
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USING: assocs formatting grouping kernel math math.primes math.statistics
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sequences sorting ;
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IN: rosetta-code.prime-conspiracy
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: transitions ( n -- alist )
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nprimes [ 10 mod ] map 2 clump histogram >alist natural-sort ;
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: t-values ( transition -- i j count freq )
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first2 [ first2 ] dip dup 10000. / ;
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: print-trans ( transition -- )
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t-values "%d -> %d count: %5d frequency: %5.2f%%\n" printf ;
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: header ( n -- )
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"First %d primes. Transitions prime %% 10 -> next-prime %% 10.\n" printf ;
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: main ( -- )
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1,000,000 dup header transitions [ print-trans ] each ;
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MAIN: main
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