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+--
+-- Perl Weekly Challenge 252
+-- Task 1
+--
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-252/>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc252;
+
+CREATE OR REPLACE FUNCTION
+pwc252.task1_plpgsql( nums int[] )
+RETURNS int
+AS $CODE$
+DECLARE
+	sumx int := 0;
+BEGIN
+
+	FOR i IN 1 .. array_length( nums, 1 ) LOOP
+	    IF mod( array_length( nums, 1 ), i ) <> 0 THEN
+	       CONTINUE;
+	    END IF;
+
+	    sumx := sumx + pow( nums[ i ], 2 );
+	END LOOP;
+
+	RETURN sumx;
+END
+$CODE$
+LANGUAGE plpgsql;