Performs factorization on just about any number.
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1 REM "FACTORISE"
2 REM By W.E. Thomson
3 REM ZX Computing Monthly
20 DATA 2,1,2,2,4
30 DATA 2,4,2,4,6,2,6,4,2,4,6,6,2,6,4,2,6,4,6,8,4,2,4,2,4,8,6,4,6,2,4,6,2,6,6,4,2,4,6,2,6,4,2,6,4,10,2,10
40 RESTORE 20
50 INPUT "INPUT A NUMBER <=4294967296: ";N
60 GO SUB 300
70 LET F=0: LET D=0
80 FOR B=0 TO 52: READ Z: LET D=D+Z
100 LET Q=N/D: IF Q<D THEN GO TO 200
110 IF Q=INT Q THEN PRINT "=" AND NOT F;D;"*";: LET F=1: LET N=Q: GO TO 100
120 NEXT B
130 RESTORE 30: LET B=4: NEXT B
200 IF NOT F THEN PRINT " IS PRIME";
210 IF F THEN GO SUB 300
220 PRINT : GO TO 40
300 LET H=INT (N/1e5)
310 IF NOT H THEN PRINT N;: RETURN
320 PRINT H;(STR$ (N-1e5*(H-1)))(2 TO );: RETURN