(In reply to
re(6): computer solution (continued) by Charlie)
DefDbl A-Z
Dim crlf$
Private Sub Form_Load()
Form1.Visible = True
Text1.Text = ""
crlf = Chr$(13) + Chr$(10)
Open "4 primes bases.txt" For Output As #2
For bse = 3 To 36
Text1.Text = Text1.Text & bse & crlf
st = bse * bse * bse
fin = st * bse
p = nxtprm(st)
Do
DoEvents
s4$ = base$(p, bse)
p1 = fromBase(Left(s4$, 1), bse)
If prmdiv(p1) = p1 And p1 > 1 Then
p2 = fromBase(Left(s4$, 2), bse)
If prmdiv(p2) = p2 Then
p3 = fromBase(Left(s4$, 3), bse)
If prmdiv(p3) = p3 Then
Print #2, bse & " " & s4 & " " & p1 & Str(p2) & Str(p3) & Str(p)
End If
End If
End If
p = nxtprm(p)
Loop Until p > fin
Next bse
Close 2
Text1.Text = Text1.Text & crlf & " done"
End Sub
Function prmdiv(num)
Dim n, dv, q
If num = 1 Then prmdiv = 1: Exit Function
n = Abs(num): If n > 0 Then limit = Sqr(n) Else limit = 0
If limit <> Int(limit) Then limit = Int(limit + 1)
dv = 2: GoSub DivideIt
dv = 3: GoSub DivideIt
dv = 5: GoSub DivideIt
dv = 7
Do Until dv > limit
GoSub DivideIt: dv = dv + 4 '11
GoSub DivideIt: dv = dv + 2 '13
GoSub DivideIt: dv = dv + 4 '17
GoSub DivideIt: dv = dv + 2 '19
GoSub DivideIt: dv = dv + 4 '23
GoSub DivideIt: dv = dv + 6 '29
GoSub DivideIt: dv = dv + 2 '31
GoSub DivideIt: dv = dv + 6 '37
Loop
If n > 1 Then prmdiv = n
Exit Function
DivideIt:
Do
q = Int(n / dv)
If q * dv = n And n > 0 Then
prmdiv = dv: Exit Function
Else
Exit Do
End If
Loop
Return
End Function
Function nxtprm(x)
Dim n
n = x + 1
While prmdiv(n) < n
n = n + 1
Wend
nxtprm = n
End Function
Function base$(n, b)
v$ = ""
n2 = n
Do
d = n2 Mod b
n2 = n2 \ b
v$ = Mid("0123456789abcdefghijklmnopqrstuvwxyz", d + 1, 1) + v$
Loop Until n2 = 0
base$ = v$
End Function
Function fromBase(n$, b)
v = 0
For i = 1 To Len(n$)
c$ = LCase$(Mid(n$, i, 1))
If c$ > " " Then
v = v * b + InStr("0123456789abcdefghijklmnopqrstuvwxyz", c$) - 1
End If
Next
fromBase = v
End Function
|
|
Posted by Charlie
on 2016-03-03 15:29:17 |
re(7): computer solution -- the program
