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IDENTIFICATION DIVISION.
PROGRAM-ID. primes.
AUTHOR. Dan Ballard.
DATA DIVISION.
WORKING-STORAGE SECTION.
01 Cnt PIC S9(10) VALUE 3.
01 TMax PIC S9(10) VALUE 3.
01 I PIC S9(10) VALUE 0.
01 isp PIC S9(10) VALUE 1.
01 tmp PIC S9(10) VALUE 1.
01 break PIC 9 VALUE 0.
01 MAX PIC S9(10) VALUE 20.
01 SQT PIC S9(10) VALUE 4.
01 SQ PIC S9(10) VALUE 2.
PROCEDURE DIVISION.
Main.
ACCEPT MAX
IF MAX < 1
DISPLAY "Invalid Max Num"
EXIT
END-IF
PERFORM UNTIL Cnt > MAX
MOVE 3 TO I
MOVE 0 TO break
MOVE 1 TO isp
PERFORM UNTIL I > SQ OR break = 1
MOVE Cnt TO isp
DIVIDE Cnt BY i GIVING tmp REMAINDER isp
IF isp = 0
MOVE 1 TO break
END-IF
ADD 2 TO I
END-PERFORM
IF NOT isp = 0
DISPLAY Cnt
END-IF
ADD 2 TO Cnt
IF Cnt > SQT
ADD 1 TO SQ
MULTIPLY SQ BY SQ GIVING SQT
END-IF
END-PERFORM
STOP RUN.