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-- Perl Weekly Challenge 164
-- Task 1
CREATE SCHEMA IF NOT EXISTS pwc164;
CREATE OR REPLACE FUNCTION
pwc164.is_prime( n int )
RETURNS boolean
AS $CODE$
DECLARE
BEGIN
FOR i IN 2 .. n - 1 LOOP
IF n % i = 0 THEN
RETURN false;
END IF;
END LOOP;
RETURN true;
END
$CODE$
LANGUAGE plpgsql;
CREATE OR REPLACE FUNCTION
pwc164.task1_plpgsql( l int DEFAULT 1000 )
RETURNS SETOF INT
AS $CODE$
DECLARE
BEGIN
FOR n IN 10 .. l LOOP
IF pwc164.is_prime( n ) AND n = reverse( n::text )::int THEN
RETURN NEXT n;
l := l - 1;
END IF;
EXIT WHEN l = 0;
END LOOP;
RETURN;
END
$CODE$
LANGUAGE plpgsql;
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