examples/primes.html

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<!DOCTYPE html>
<script src="../wwwbasic.js"></script>
<script type="text/basic">

DECLARE FUNCTION GetBase3LengthOfNumber(n)

PRINT 2; " ";
FOR i = 3 TO 3000 STEP 2
  numLength = GetBase3LengthOfNumber(i) + 1
  FOR j = 3 TO i / numLength STEP 2
    IF i MOD j = 0 THEN GOTO NotPrime
  NEXT j
  PRINT i; " ";
  NotPrime:
NEXT i
END

FUNCTION GetBase3LengthOfNumber(n)
  digits = 1
  WHILE digits > 2
    digits = digits + 1
    n = n / 3
  WEND
  GetBase3LengthOfNumber = digits
END FUNCTION

</script>