# Number 23

## Properties#

- 23 is 6th additive prime because sum of its digits is 5 which is also prime
- 23 is 9th chen prime
- 23 is 7th class 1+ prime
- 23 is part of 4th cousin prime {19,
**23**} - 23 is 5th factorial prime
- 23 is 4th happy prime
- 23 is 4th harmonic prime
- 23 is 2nd isolated prime
- 23 is 3rd kynea prime
- 23 is 7th left-truncatable prime
- 23 is 4th long prime
- 23 is 7th pierpont prime of the 2nd kind
- 23 is 9th prime
- 23 is part of 2nd prime quintuplet 2 {11, 13, 17, 19,
**23**} - 23 is part of 1st prime sextuplet {7, 11, 13, 17, 19,
**23**} - 23 is part of 5th prime triplet {17, 19,
**23**} - 23 is 5th right-truncatable prime
- 23 is 4th safe prime, its corresponding Sophie Germain prime is 11
- 23 is part of 6th sexy prime {
**23**, 29} - 23 is part of 5th sexy prime {17,
**23**} - 23 is part of 1st sexy prime quadruplets {5, 11, 17,
**23**} - 23 is part of 2nd sexy prime quadruplets {11, 17,
**23**, 29} - 23 is part of 4th sexy prime triplet {17,
**23**, 29} - 23 is part of 3rd sexy prime triplet {11, 17,
**23**} - 23 is 8th solinas prime
- 23 is 5th sophie germain prime, its corresponding Safe prime is 47
- 23 is 4th thabit prime
- 23 is 5th two-sided prime
- 23 is 4th wedderburn-etherington prime
- 23 is 2nd woodall prime

## External#

## Neighbours#

11_{36} | 12 | 13_{32} | 14_{1} | 15_{1} |

16 | 17_{36} | 18 | 19_{18} | 20 |

21_{1} | 22_{1} | 23_{30} | 24 | 25_{1} |

26_{1} | 27 | 28 | 29_{14} | 30 |

31_{18} | 32 | 33_{1} | 34_{1} | 35_{1} |

## Compare with#

11_{36} | 12 | 13_{32} | 14_{1} | 15_{1} |

16 | 17_{36} | 18 | 19_{18} | 20 |

21_{1} | 22_{1} | 23_{30} | 24 | 25_{1} |

26_{1} | 27 | 28 | 29_{14} | 30 |

31_{18} | 32 | 33_{1} | 34_{1} | 35_{1} |

## Different Representations#

- 23 in roman numerals is XXIII
- 23 in base 2 is 10111
_{2} - 23 in base 3 is 212
_{3} - 23 in base 4 is 113
_{4} - 23 in base 5 is 43
_{5} - 23 in base 6 is 35
_{6} - 23 in base 7 is 32
_{7} - 23 in base 8 is 27
_{8} - 23 in base 9 is 25
_{9} - 23 in base 10 is 23
_{10} - 23 in base 11 is 21
_{11} - 23 in base 12 is 1b
_{12} - 23 in base 13 is 1a
_{13} - 23 in base 14 is 19
_{14} - 23 in base 15 is 18
_{15} - 23 in base 16 is 17
_{16}

## Belongs Into#

- 23 belongs into first 10 additive primes.
- 23 belongs into first 10 chen primes.
- 23 belongs into first 10 class 1+ primes.
- 23 belongs into first 10 cousin primes.
- 23 belongs into first 10 factorial primes.
- 23 belongs into first 10 happy primes.
- 23 belongs into first 10 harmonic primes.
- 23 belongs into first 10 isolated primes.
- 23 belongs into first 10 kynea primes.
- 23 belongs into first 10 left-truncatable primes.
- 23 belongs into first 10 long primes.
- 23 belongs into first 10 pierpont prime of the 2nd kinds.
- 23 belongs into first 10 primes.
- 23 belongs into first 10 prime quintuplet 2s.
- 23 belongs into first 10 prime sextuplets.
- 23 belongs into first 10 prime triplets.
- 23 belongs into first 10 right-truncatable primes.
- 23 belongs into first 10 safe primes.
- 23 belongs into first 10 sexy primes.
- 23 belongs into first 10 sexy primes.
- 23 belongs into first 10 sexy prime quadrupletss.
- 23 belongs into first 10 sexy prime quadrupletss.
- 23 belongs into first 10 sexy prime triplets.
- 23 belongs into first 10 sexy prime triplets.
- 23 belongs into first 10 solinas primes.
- 23 belongs into first 10 sophie germain primes.
- 23 belongs into first 10 thabit primes.
- 23 belongs into first 10 two-sided primes.
- 23 belongs into first 10 wedderburn-etherington primes.
- 23 belongs into first 10 woodall primes.

## You May Also Ask#

- Is 23 additive prime?
- Is 23 bell prime?
- Is 23 carol prime?
- Is 23 centered decagonal prime?
- Is 23 centered heptagonal prime?
- Is 23 centered square prime?
- Is 23 centered triangular prime?
- Is 23 chen prime?
- Is 23 class 1+ prime?
- Is 23 part of cousin prime?
- Is 23 cuban prime 1?
- Is 23 cuban prime 2?
- Is 23 cullen prime?
- Is 23 dihedral prime?
- Is 23 double mersenne prime?
- Is 23 emirps?
- Is 23 euclid prime?
- Is 23 factorial prime?
- Is 23 fermat prime?
- Is 23 fibonacci prime?
- Is 23 genocchi prime?
- Is 23 good prime?
- Is 23 happy prime?
- Is 23 harmonic prime?
- Is 23 isolated prime?
- Is 23 kynea prime?
- Is 23 left-truncatable prime?
- Is 23 leyland prime?
- Is 23 long prime?
- Is 23 lucas prime?
- Is 23 lucky prime?
- Is 23 mersenne prime?
- Is 23 mills prime?
- Is 23 multiplicative prime?
- Is 23 palindromic prime?
- Is 23 pierpont prime?
- Is 23 pierpont prime of the 2nd kind?
- Is 23 prime?
- Is 23 part of prime quadruplet?
- Is 23 part of prime quintuplet 1?
- Is 23 part of prime quintuplet 2?
- Is 23 part of prime sextuplet?
- Is 23 part of prime triplet?
- Is 23 proth prime?
- Is 23 pythagorean prime?
- Is 23 quartan prime?
- Is 23 restricted left-truncatable prime?
- Is 23 restricted right-truncatable prime?
- Is 23 right-truncatable prime?
- Is 23 safe prime?
- Is 23 semiprime?
- Is 23 part of sexy prime?
- Is 23 part of sexy prime quadruplets?
- Is 23 part of sexy prime triplet?
- Is 23 solinas prime?
- Is 23 sophie germain prime?
- Is 23 super prime?
- Is 23 thabit prime?
- Is 23 thabit prime of the 2nd kind?
- Is 23 part of twin prime?
- Is 23 two-sided prime?
- Is 23 ulam prime?
- Is 23 wagstaff prime?
- Is 23 weakly prime?
- Is 23 wedderburn-etherington prime?
- Is 23 wilson prime?
- Is 23 woodall prime?

## Smaller than 23#

- Additive primes up to 23
- Bell primes up to 23
- Carol primes up to 23
- Centered decagonal primes up to 23
- Centered heptagonal primes up to 23
- Centered square primes up to 23
- Centered triangular primes up to 23
- Chen primes up to 23
- Class 1+ primes up to 23
- Cousin primes up to 23
- Cuban primes 1 up to 23
- Cuban primes 2 up to 23
- Cullen primes up to 23
- Dihedral primes up to 23
- Double mersenne primes up to 23
- Emirps up to 23
- Euclid primes up to 23
- Factorial primes up to 23
- Fermat primes up to 23
- Fibonacci primes up to 23
- Genocchi primes up to 23
- Good primes up to 23
- Happy primes up to 23
- Harmonic primes up to 23
- Isolated primes up to 23
- Kynea primes up to 23
- Left-truncatable primes up to 23
- Leyland primes up to 23
- Long primes up to 23
- Lucas primes up to 23
- Lucky primes up to 23
- Mersenne primes up to 23
- Mills primes up to 23
- Multiplicative primes up to 23
- Palindromic primes up to 23
- Pierpont primes up to 23
- Pierpont primes of the 2nd kind up to 23
- Primes up to 23
- Prime quadruplets up to 23
- Prime quintuplet 1s up to 23
- Prime quintuplet 2s up to 23
- Prime sextuplets up to 23
- Prime triplets up to 23
- Proth primes up to 23
- Pythagorean primes up to 23
- Quartan primes up to 23
- Restricted left-truncatable primes up to 23
- Restricted right-truncatable primes up to 23
- Right-truncatable primes up to 23
- Safe primes up to 23
- Semiprimes up to 23
- Sexy primes up to 23
- Sexy prime quadrupletss up to 23
- Sexy prime triplets up to 23
- Solinas primes up to 23
- Sophie germain primes up to 23
- Super primes up to 23
- Thabit primes up to 23
- Thabit primes of the 2nd kind up to 23
- Twin primes up to 23
- Two-sided primes up to 23
- Ulam primes up to 23
- Wagstaff primes up to 23
- Weakly primes up to 23
- Wedderburn-etherington primes up to 23
- Wilson primes up to 23
- Woodall primes up to 23

## First 23#

- First 23 additive primes
- First 23 bell primes
- First 23 carol primes
- First 23 centered decagonal primes
- First 23 centered heptagonal primes
- First 23 centered square primes
- First 23 centered triangular primes
- First 23 chen primes
- First 23 class 1+ primes
- First 23 cousin primes
- First 23 Cuban primes 1
- First 23 Cuban primes 2
- First 23 cullen primes
- First 23 dihedral primes
- First 23 double mersenne primes
- First 23 Emirps
- First 23 euclid primes
- First 23 factorial primes
- First 23 fermat primes
- First 23 fibonacci primes
- First 23 genocchi primes
- First 23 good primes
- First 23 happy primes
- First 23 harmonic primes
- First 23 isolated primes
- First 23 kynea primes
- First 23 left-truncatable primes
- First 23 leyland primes
- First 23 long primes
- First 23 lucas primes
- First 23 lucky primes
- First 23 mersenne primes
- First 23 mills primes
- First 23 multiplicative primes
- First 23 palindromic primes
- First 23 pierpont primes
- First 23 Pierpont primes of the 2nd kind
- First 23 primes
- First 23 prime quadruplets
- First 23 prime quintuplet 1s
- First 23 prime quintuplet 2s
- First 23 prime sextuplets
- First 23 prime triplets
- First 23 proth primes
- First 23 pythagorean primes
- First 23 quartan primes
- First 23 restricted left-truncatable primes
- First 23 restricted right-truncatable primes
- First 23 right-truncatable primes
- First 23 safe primes
- First 23 semiprimes
- First 23 sexy primes
- First 23 sexy prime quadrupletss
- First 23 sexy prime triplets
- First 23 solinas primes
- First 23 sophie germain primes
- First 23 super primes
- First 23 thabit primes
- First 23 Thabit primes of the 2nd kind
- First 23 twin primes
- First 23 two-sided primes
- First 23 ulam primes
- First 23 wagstaff primes
- First 23 weakly primes
- First 23 wedderburn-etherington primes
- First 23 wilson primes
- First 23 woodall primes