Put it in the same folder as your GW-BASIC program. Load it and run it.

10 'Goldbach conjecture 20 CLS :KEY OFF :CLEAR 30 PRINT "GOLDBACH CONJECTURE" :PRINT 40 PRINT "Every even number greater than 2 can be written as the sum of two primes." :PRINT 50 'Count and list Goldbach Prime Pairs 60 INPUT "Enter a test number ";T 70 T=2*INT(T/2) 'Ensure test number is even 80 N=0 90 FOR K=3 TO T-3 STEP 2 100 X=SQR(K) 110 Z=0 120 FOR J=3 TO X STEP 2 130 IF K/J-INT(K/J)=0 THEN LET Z=Z+1 140 NEXT J 150 IF Z=0 THEN GOSUB 180 'found a prime, check for 2nd prime 160 NEXT K 170 END 180 'SUBROUTINE to test if other component is also prime 190 L=T-K 200 P=SQR(L) 210 Y=0 220 FOR M=3 TO P STEP 2 230 IF L/M-INT(L/M)=0 THEN LET Y=Y+1 240 NEXT M 250 IF Y=0 AND L>K THEN LET N=N+1 :PRINT,,USING"######";N;K;L 260 RETURN |