**List of all possible 53 combinations if 13 and 6 has at least to be used once:**

1. (13 x 1) + (6 x 1)= 19

2. (13 x 1) + (6 x 2)= 25

3. (13 x 1) + (6 x 3)= 31

4. (13 x 1) + (6 x 4)= 37

5. (13 x 1) + (6 x 5)= 43

6. (13 x 1) + (6 x 6)= 49

7. (13 x 1) + (6 x 7)= 55

8. (13 x 1) + (6 x 8)= 61

9. (13 x 1) + (6 x 9)= 67

10. (13 x 1) + (6 x 10)= 73

11. (13 x 1) + (6 x 11)= 79

12. (13 x 1) + (6 x 12)= 85

13. (13 x 1) + (6 x 13)= 91

14. (13 x 1) + (6 x 14)= 97

15. (13 x 2) + (6 x 1)= 32

16. (13 x 2) + (6 x 2)= 38

17. (13 x 2) + (6 x 3)= 44

18. (13 x 2) + (6 x 4)= 50

19. (13 x 2) + (6 x 5)= 56

20. (13 x 2) + (6 x 6)= 62

21. (13 x 2) + (6 x 7)= 68

22. (13 x 2) + (6 x 8)= 74

23. (13 x 2) + (6 x 9)= 80

24. (13 x 2) + (6 x 10)= 86

25. (13 x 2) + (6 x 11)= 92

26. (13 x 2) + (6 x 12)= 98

27. (13 x 3) + (6 x 1)= 45

28. (13 x 3) + (6 x 2)= 51

29. (13 x 3) + (6 x 3)= 57

30. (13 x 3) + (6 x 4)= 63

31. (13 x 3) + (6 x 5)= 69

32. (13 x 3) + (6 x 6)= 75

33. (13 x 3) + (6 x 7)= 81

34. (13 x 3) + (6 x 8)= 87

35. (13 x 3) + (6 x 9)= 93

36. (13 x 3) + (6 x 10)= 99

37. (13 x 4) + (6 x 1)= 58

38. (13 x 4) + (6 x 2)= 64

39. (13 x 4) + (6 x 3)= 70

40. (13 x 4) + (6 x 4)= 76

41. (13 x 4) + (6 x 5)= 82

42. (13 x 4) + (6 x 6)= 88

43. (13 x 4) + (6 x 7)= 94

44. (13 x 4) + (6 x 8)= 100

45. (13 x 5) + (6 x 1)= 71

46. (13 x 5) + (6 x 2)= 77

47. (13 x 5) + (6 x 3)= 83

48. (13 x 5) + (6 x 4)= 89

49. (13 x 5) + (6 x 5)= 95

50. (13 x 6) + (6 x 1)= 84

51. (13 x 6) + (6 x 2)= 90

52. (13 x 6) + (6 x 3)= 96

53. (13 x 7) + (6 x 1)= 97

Max number that is not possible with 13 and 6 is **78.**

**List of all possible 77 combinations with 13 and 6:**

(13 x 0) + (6 x 0)= 0

(13 x 0) + (6 x 1)= 6

(13 x 0) + (6 x 2)= 12

(13 x 0) + (6 x 3)= 18

(13 x 0) + (6 x 4)= 24

(13 x 0) + (6 x 5)= 30

(13 x 0) + (6 x 6)= 36

(13 x 0) + (6 x 7)= 42

(13 x 0) + (6 x 8)= 48

(13 x 0) + (6 x 9)= 54

(13 x 0) + (6 x 10)= 60

(13 x 0) + (6 x 11)= 66

(13 x 0) + (6 x 12)= 72

(13 x 0) + (6 x 13)= 78

(13 x 0) + (6 x 14)= 84

(13 x 0) + (6 x 15)= 90

(13 x 0) + (6 x 16)= 96

(13 x 1) + (6 x 0)= 13

(13 x 1) + (6 x 1)= 19

(13 x 1) + (6 x 2)= 25

(13 x 1) + (6 x 3)= 31

(13 x 1) + (6 x 4)= 37

(13 x 1) + (6 x 5)= 43

(13 x 1) + (6 x 6)= 49

(13 x 1) + (6 x 7)= 55

(13 x 1) + (6 x 8)= 61

(13 x 1) + (6 x 9)= 67

(13 x 1) + (6 x 10)= 73

(13 x 1) + (6 x 11)= 79

(13 x 1) + (6 x 12)= 85

(13 x 1) + (6 x 13)= 91

(13 x 1) + (6 x 14)= 97

(13 x 2) + (6 x 0)= 26

(13 x 2) + (6 x 1)= 32

(13 x 2) + (6 x 2)= 38

(13 x 2) + (6 x 3)= 44

(13 x 2) + (6 x 4)= 50

(13 x 2) + (6 x 5)= 56

(13 x 2) + (6 x 6)= 62

(13 x 2) + (6 x 7)= 68

(13 x 2) + (6 x 8)= 74

(13 x 2) + (6 x 9)= 80

(13 x 2) + (6 x 10)= 86

(13 x 2) + (6 x 11)= 92

(13 x 2) + (6 x 12)= 98

(13 x 3) + (6 x 0)= 39

(13 x 3) + (6 x 1)= 45

(13 x 3) + (6 x 2)= 51

(13 x 3) + (6 x 3)= 57

(13 x 3) + (6 x 4)= 63

(13 x 3) + (6 x 5)= 69

(13 x 3) + (6 x 6)= 75

(13 x 3) + (6 x 7)= 81

(13 x 3) + (6 x 8)= 87

(13 x 3) + (6 x 9)= 93

(13 x 3) + (6 x 10)= 99

(13 x 4) + (6 x 0)= 52

(13 x 4) + (6 x 1)= 58

(13 x 4) + (6 x 2)= 64

(13 x 4) + (6 x 3)= 70

(13 x 4) + (6 x 4)= 76

(13 x 4) + (6 x 5)= 82

(13 x 4) + (6 x 6)= 88

(13 x 4) + (6 x 7)= 94

(13 x 4) + (6 x 8)= 100

(13 x 5) + (6 x 0)= 65

(13 x 5) + (6 x 1)= 71

(13 x 5) + (6 x 2)= 77

(13 x 5) + (6 x 3)= 83

(13 x 5) + (6 x 4)= 89

(13 x 5) + (6 x 5)= 95

(13 x 6) + (6 x 0)= 78

(13 x 6) + (6 x 1)= 84

(13 x 6) + (6 x 2)= 90

(13 x 6) + (6 x 3)= 96

(13 x 7) + (6 x 0)= 91

(13 x 7) + (6 x 1)= 97

Max number that is not possible with 13 and 6 is **59**