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@@ -1,5 +1,5 @@
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1
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1
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# Finding lucas pseudoprimes
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2
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-from math import sqrt
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2
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+from math import sqrt, gcd
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3
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3
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4
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4
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def isqrt(n):
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5
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5
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""" Find the integer square root of n via newton's method, code via
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@@ -21,4 +21,48 @@ def hasIntSQRT(n):
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21
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21
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isq = isqrt(n)
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22
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22
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return isq * isq == n
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23
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23
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+def Dsequence():
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25
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+ """Generate sequence 5, -7, 9, -11, 13, -15...
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26
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+ """
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27
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+ val = 5
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28
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+ while True:
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29
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+ if val % 4 == 1:
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+ yield val
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+ else:
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+ yield -val
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+ val = val + 2
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+
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35
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+def Legendere(a, p):
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36
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+ if (p % 2 == 0):
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37
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+ raise ValueError("p must be odd, is {}".format(p))
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38
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+ lv = pow(a, (p-1)//2, p)
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+ if lv == p - 1:
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40
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+ lv = -1
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+ return lv
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+
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+def Jacobi(a, n):
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+ if (n % 2 == 0):
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+ raise ValueError("n must be odd, is {}".format(n))
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+ a = a % n
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47
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+ mv = 1
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48
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+ if (a % 2 == 0):
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49
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+ a = a // 2
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50
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+ nm8 = n % 8
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+ if (nm8 == 3 or nm8 == 5):
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+ mv = -1
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+ if n == 1:
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54
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+ return mv * 1
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55
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+ if gcd(a, n) != 1:
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+ return 0
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57
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+ return mv * Jacobi(n, a)
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58
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+
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59
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+for n in range(1, 21, 2):
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60
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+ print("{}:\t{}".format(n, Jacobi(3, n)))
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61
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+
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62
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+
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63
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+
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64
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+
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65
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+
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+
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+
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24
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68
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