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CREATE SCHEMA IF NOT EXISTS pwc158;
CREATE OR REPLACE FUNCTION
pwc158.is_prime( v bigint )
RETURNS bool
AS $CODE$
DECLARE
i int;
BEGIN
FOR i IN 2 .. v - 1 LOOP
IF ( v % i = 0 ) THEN
RETURN false;
END IF;
END LOOP;
RETURN true;
END
$CODE$
LANGUAGE plpgsql;
CREATE OR REPLACE FUNCTION
pwc158.cuban( v bigint )
RETURNS bigint
AS $CODE$
SELECT pow( v + 1, 3 ) - pow( v, 3 );
$CODE$
LANGUAGE sql;
SELECT pwc158.cuban( v )
FROM generate_series( 1, 100 ) v
WHERE pwc158.is_prime( pwc158.cuban( v ) )
;
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