calculand - Numbers and primes

Quick check, long-number-check: is it a prime number or not? → max. 15 digits


 

Set the number you want to start with and let it calculate → max. 5 digits

From to
 

Table 1: Numbers from 2 to 41

2

Prime

3

Prime

4

division by:
2

5

Prime

6

division by:
2 3

7

Prime

8

division by:
2 4

9

division by:
3

10

division by:
2 5

11

Prime

12

division by:
2 3 4 6

13

Prime

14

division by:
2 7

15

division by:
3 5

16

division by:
2 4 8

17

Prime

18

division by:
2 3 6 9

19

Prime

20

division by:
2 4 5 10

21

division by:
3 7

22

division by:
2 11

23

Prime

24

division by:
2 3 4 6 8 12

25

division by:
5

26

division by:
2 13

27

division by:
3 9

28

division by:
2 4 7 14

29

Prime

30

division by:
2 3 5 6 10 15

31

Prime

32

division by:
2 4 8 16

33

division by:
3 11

34

division by:
2 17

35

division by:
5 7

36

division by:
2 3 4 6 9 12 18

37

Prime

38

division by:
2 19

39

division by:
3 13

40

division by:
2 4 5 8 10 20

41

Prime

Table 2: Numbers from 42 to 81

42

division by:
2 3 6 7 14 21

43

Prime

44

division by:
2 4 11 22

45

division by:
3 5 9 15

46

division by:
2 23

47

Prime

48

division by:
2 3 4 6 8 12 16 24

49

division by:
7

50

division by:
2 5 10 25

51

division by:
3 17

52

division by:
2 4 13 26

53

Prime

54

division by:
2 3 6 9 18 27

55

division by:
5 11

56

division by:
2 4 7 8 14 28

57

division by:
3 19

58

division by:
2 29

59

Prime

60

division by:
2 3 4 5 6 10 12 15 20 30

61

Prime

62

division by:
2 31

63

division by:
3 7 9 21

64

division by:
2 4 8 16 32

65

division by:
5 13

66

division by:
2 3 6 11 22 33

67

Prime

68

division by:
2 4 17 34

69

division by:
3 23

70

division by:
2 5 7 10 14 35

71

Prime

72

division by:
2 3 4 6 8 9 12 18 24 36

73

Prime

74

division by:
2 37

75

division by:
3 5 15 25

76

division by:
2 4 19 38

77

division by:
7 11

78

division by:
2 3 6 13 26 39

79

Prime

80

division by:
2 4 5 8 10 16 20 40

81

division by:
3 9 27

© 2010 - 2025 Norbert Schneider