Help with math please

Question

Ayush, Bhanu, Freya, Jacob, Stan, and Stanley are playing a game. They are taking turns counting,

starting with 1. Ayush says 1, Bhanu says 2, Freya says 3, and so on. Any player saying their fourth

prime number leaves the game. The game ends when everyone has said four different prime numbers.

What is the units digit of the last number said?

Answer 1

1,2,3,4,5,6 bhanu, freya, stan got one each for 2, 3, 5

7,8,9,10,11,12 ayush 1, stan now 2

13,14,15,16,17,18 ayush 2, stan 3

19,20,21,22,23,24 ayush 3, stan 4 & out

25,26,27,28,29,30 ayush 4 & out

31,32,33,34,35,36 f 2,, just b,f,j & sl left

37,38,39,40,41,42 sl 2,

42,43,44,45 f3

46,47,48,49 f4 & out

50,51,52,53 sl3

54,55,56

58,59,60 j2

61,62,63 b2

64,65,66

67,68,69 b3

70,71,72 j3

73,74,75 b4 out

76,77

78,79 sl out

80,81

82,83 j out on 83

units digit is 3

(no guarantee this answer is right but at least 33% chance it is 3,7 or 9, can't be 0,2,4,5,6,or 8))