23| . .return True

24|

25|num = 0

26|def divisor(m):

27| . .global num

28| . .for c in L:

29| . . . .k = m // c

30| . . . .if k * c == m:

31| . . . . . .num = c

32| . . . . . .return k

33|

34|def decompose(m): # разложение на сомножители

35| . .s = ''

36| . .while m > 1:

37| . . . .m = divisor(m)

38| . . . .s = s + str(num)+'*'

39| . .return s[:-1]

40|

41|for n in range(3,10000000):

42| . .if is_prime(n):

43| . . . .L.append(n)

44| . . . .s = decompose(n-1)+ ' '+str(n)+' '+decompose(n+1)

45| . . . .#List.append('---')

46| . . . .List.append(s)

47|

48|for i in List:

49| . .if i.find('2*3') == -1:

50| . . . .print(i)

51|

52|#SaveList(List)

53|

54|t1 = time.time()

55|print('Time required :', t1 - t0)

56|print('Done!')

57|

58|# for n in range(3,10000000):

59|# Time required : 1540.0686304569244 = 25,666 min

////////////

04.08.23

prostoe6_a.txt

Проверяется окружение простого числа на делимость на 3.

1|#!/usr/bin/env python

 2|# -*- codning: utf-8 -*-

 3|import math, time

 4|t0 = time.time()

 5|

 6|def is_prime(n):

 7| . .if n <= 1:

 8| . . . .return False

 9| . .if n % 2 == 0:

10| . . . .return n == 2

11|

12| . .max_div = math.floor(math.sqrt(n))

13| . .for i in range(3, 1 + max_div, 2):

14| . . . .if n % i == 0:

15| . . . . . .return False

16| . .return True

17|

18|for n in range(3,100000000):

19| . .if is_prime(n):

20| . . . .#print(n)

21| . . . .if (n-1) % 3 != 0:

22| . . . . . .if (n+1) % 3 != 0:

23| . . . . . . . .print(n)

25|

26|t1 = time.time()

27|print('Time required :', t1 - t0)

28|print('Done!')

29|

30|# for n in range(3,10000000):

31|# Time required : 43.06231665611267

32|

33|# for n in range(3,100000000):

34|# Time required : 1084.299929857254 18 MIN

---

Такие вот дела.