Prime number

the prime numbers has 2 divisors

categories of prime numbers
the first 30 primes below 100

2, 3, 5, 7, B, 10, 14, 16, 1X, 23, 25, 2B, 32, 24, 38, 41, 47, 49, 52, 56, 58, 61, 65, 6B, 76, 7X, 7J, 83, 85, 89, 9X, X1, X7, X9, B6, B8, J1, J7, JB

the sum of the primes
2

2+3 = 5

2+3+5 = X

2+3+5+7 = 14

2+3+5+7+B = 22

2+3+5+7+B+10 = 32

2+3+5+7+B+10+14 = 46

2+3+5+7+B+10+14+16 = 5J

2+3+5+7+B+10+14+16+1X = 79

2+3+5+7+B+10+14+16+1X+23 = 9J

2+3+5+7+B+10+14+16+1X+23+25 = J4

2+3+5+7+B+10+14+16+1X+23+25+2B = 122

2+3+5+7+B+10+14+16+1X+23+25+2B+32 = 154

2+3+5+7+B+10+14+16+1X+23+25+2B+32+34 = 188

2+3+5+7+B+10+14+16+1X+23+25+2B+32+34+38 = 1J3

Sum of the last digits of primes
2

2+3 = 5

2+3+5 = X

2+3+5+7= 14

2+3+5+7+B = 22

2+3+5+7+B+0 = 22

2+3+5+7+B+0+4 = 26

2+3+5+7+B+0+4+6 = 2J

2+3+5+7+B+0+4+6+X = 39

2+3+5+7+B+0+4+6+X+3 = 3J

2+3+5+7+B+0+4+6+X+3+5 = 44

2+3+5+7+B+0+4+6+X+3+5+B = 52

2+3+5+7+B+0+4+6+X+3+5+B+2 = 54

2+3+5+7+B+0+4+6+X+3+5+B+2+4 = 58

2+3+5+7+B+0+4+6+X+3+5+B+2+4+8 = 63

2+3+5+7+B+0+4+6+X+3+5+B+2+4+8+1 = 64

2+3+5+7+B+0+4+6+X+3+5+B+2+4+8+1+7 = 6B

2+3+5+7+B+0+4+6+X+3+5+B+2+4+8+1+7+9 = 77

Primes ending in N
the primes only can ends in 1, 2, 3, 4, 5, 6, 7, 8, 9, X, B or J. the only prime ending in 0 is 10

prime numbers ending in 1
41 (decimal 53): the first prime number ending in 1

61 (decimal 79): the second prime number ending in 1

X1 (decimal 131)

J1 (decimal 157)

1B1 (decimal 313)

281 (decimal 443)

prime numbers ending in 2
2 (the only even number is prime)

32 (decimal 41)

52 (decimal 67)

122 (decimal 197)

142 (decimal 223)

212 (decimal 353)

232 (decimal 379)

272 (decimal 431)

292 (decimal 457)

Prime numbers ending in 3
3

23 (decimal 29)

83 (decimal 107)

133 (decimal 211)

173 (decimal 263)

223 (Decimal 367)

263 (decimal 419)

Prime numbers ending in 4
14 (decimal 17)

34 (decimal 43)

104 (decimal 173)

124 (decimal 199)

164 (decimal 251)

184 (decimal 277)

274 (decimal 433)

prime numbers ending in 5
5

25 (decimal 31)

65 (decimal 83)

85 (decimal 109)

155 (decimal 239)

1B5 (decimal 317)

265 (decimal 421)

2J5 (decimal 499)

Prime numbers ending in 6
16 (decimal 19)

Largest known prime number
The largest known prime is a Mersenne prime 2141591XX - 1 is the largest prime