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Development of Algorithmic Constructions

06:44:22 18.Apr 2024

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Polynom = x^2-24x+17

1. Algorithm

a:=1;
b:=-24;
c:=17;


liste_max:=100000;

sieving:=proc (stelle, p)
begin
   while (stelle<=liste_max) do
     erg:=liste[stelle];
     while(erg mod p=0) do
        // Divison of the stored f(x) by the prime
        erg:=erg /p;
     end_while;
     liste[stelle]:=erg;
     stelle:=stelle+p;
   end_while;
end_proc;

// Calculation of the values of the polynom for x from 0 to liste_max
for x from 0 to liste_max do
   p:=abs (a*x^2+b*x+c);
   while (p mod 2=0) p:=p/2;
   liste [x]:=p;
end_for;

for x from 0 to liste_max do
    p:=liste[x];

    if (p>1) then

      // Printing the Primes
      print (x, p);

      // 1. Sieving
      sieving (x+p,  p);

      t:=(-x-b/a) mod p;
      if t=0 then t:=p; end_if;

      // 2. Sieving
      sieving (t, p);

    end_if;

end_for;

 2. Mathematical background
Lemma: If p | f(x) then also p | f(x+p) and  p | f(-x-b/a)

a)  p | f(x)   <=> ax^2 + bx + c = 0                       mod p
    p | f(x+p) <=> a(x+p)^2 + b(x+p) + c = 0               mod p
               <=> ax^2 + 2axp + ap^2 + bx + bp + c = 0    mod p
               <=> ax^2 + bx + c = 0                       mod p

    Thus if p | f(x) then p | f(x+p)

b)  if b = 0 mod a
    p | f(x)       <=> ax^2 + bx + c = 0                         mod p
    p | f(-x-b/a)  <=> a(-x-b/a)^2 + b(-x-b/a) + c = 0           mod p
                   <=> ax^2 + 2bx + b^2/a - bx - b^2/a + c = 0   mod p
                   <=> ax^2 + bx + c = 0                         mod p

    Thus if p | f(x)  then p | f(-x-b/a)



 3. Correctness of the algorithm
The proof for this polynom is similar to the proof for the polynom f(x)=x^2-4x+1.

a) First terms for the polynom f(x) = x^2-24x+17

f(0)=17
f(1)=3
f(2)=1
f(3)=23
f(4)=7
f(5)=13
f(6)=1
f(7)=1
f(8)=37
f(9)=59
f(10)=41
f(11)=1
f(12)=127
f(13)=1
f(14)=1
f(15)=1
f(16)=1
f(17)=1
f(18)=1
f(19)=1
f(20)=1
f(21)=1
f(22)=1
f(23)=1
f(24)=1
f(25)=1
f(26)=1
f(27)=1
f(28)=43
f(29)=1
f(30)=197
f(31)=1
f(32)=1
f(33)=157
f(34)=1
f(35)=67
f(36)=449
f(37)=83
f(38)=61
f(39)=1
f(40)=73
f(41)=1
f(42)=773
f(43)=139
f(44)=1
f(45)=1
f(46)=1
f(47)=1
f(48)=167
f(49)=1
f(50)=439
f(51)=1
f(52)=491
f(53)=1
f(54)=1637
f(55)=1
f(56)=1
f(57)=1
f(58)=1
f(59)=347
f(60)=311
f(61)=379
f(62)=113
f(63)=1237
f(64)=859
f(65)=149
f(66)=2789
f(67)=1
f(68)=1
f(69)=223
f(70)=1
f(71)=1
f(72)=151
f(73)=599
f(74)=1
f(75)=1
f(76)=1
f(77)=683
f(78)=4229
f(79)=727
f(80)=1499
f(81)=331
f(82)=1
f(83)=1
f(84)=389
f(85)=1
f(86)=1783
f(87)=2749
f(88)=269
f(89)=967
f(90)=1
f(91)=1019
f(92)=1
f(93)=3217
f(94)=733
f(95)=1
f(96)=1
f(97)=1
f(98)=2423
f(99)=1

b) Substitution of the polynom
The polynom f(x)=x^2-24x+17  could be written as f(y)= y^2-127 with x=y+12

c) Backsubstitution

Beside by backsubstitution you get an estimation for the huge of the primes with p | f(x) and p < f(x)

f'(y)>(2y-1) with with y=x-12
f'(x)>2x-25  with x > 11

4. Infinity of the sequence

5. Sequence of the polynom with 1

6. Sequence of the polynom (only primes)

7. Distribution of the primes

8. Check for existing Integer Sequences by OEIS

Found in Database : 17, 3, 1, 23, 7, 13, 1, 1, 37, 59, 41, 1, 127, 1, 1, 1, 1, 1, 1, 1,
Found in Database : 17, 3, 23, 7, 13, 37, 59, 41, 127, 43, 197, 157, 67, 449, 83, 61,
Found in Database : 3, 7, 13, 17, 23, 37, 41, 43, 59, 61, 67, 73, 83, 113, 127, 139, 149,