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-- Perl Weekly Challenge 169
-- Task 2
CREATE SCHEMA IF NOT EXISTS pwc169;
CREATE OR REPLACE FUNCTION
pwc169.task2_plpgsql( n int DEFAULT 20 )
RETURNS SETOF INT
AS $CODE$
DECLARE
i int;
current_min int;
current_gcd int;
previous_gcd int;
BEGIN
FOR i IN 1 .. 999999 LOOP
WITH bag AS (
SELECT f, count(*) AS counter
FROM pwc169.compute_factors( i ) f
GROUP BY f
)
SELECT min( counter )
INTO current_min
FROM bag
;
IF current_min < 2 THEN
CONTINUE;
END IF;
previous_gcd := -1;
FOR current_gcd IN SELECT count(f) FROM pwc169.compute_factors( i ) f GROUP BY f LOOP
IF previous_gcd < 0 THEN
previous_gcd := current_gcd;
CONTINUE;
END IF;
previous_gcd := gcd( previous_gcd, current_gcd );
END LOOP;
IF previous_gcd = 1 THEN
RETURN NEXT i;
IF n = 0 THEN
RETURN;
END IF;
n := n - 1;
END IF;
END LOOP;
RETURN;
END
$CODE$
LANGUAGE plpgsql;
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