Compare 247 vs 257
Property | 247 | 257 |
---|---|---|
Type | semiprime | prime |
Unique factors | 2 | 1 |
Total factors | 2 | 1 |
Prime factorization | 131 × 191 | 2571 |
Prime factorization | 13 × 19 | 257 |
Divisors count | 4 | 2 |
Divisors | 1, 13, 19, 247 | 1, 257 |
Number of properties | 1 | 16 |
Chen primes | 42nd | |
Fermat primes | 4th | |
Good primes | 20th | |
Isolated primes | 22nd | |
Long primes | 21st | |
Pierpont primes | 14th | |
Primes | 55th | |
Proth primes | 10th | |
Pythagorean primes | 25th | |
Quartan primes | 4th | |
Semiprimes | 79th | |
Sexy primes (1st member) | 31st | |
Sexy primes (2nd member) | 30th | |
Sexy prime quadrupletss (2nd member) | 5th | |
Sexy prime triplets (1st member) | 16th | |
Sexy prime triplets (2nd member) | 15th | |
Solinas primes | 31st | |
Roman numberals | CCXLVII | CCLVII |
Base 2 | 111101112 | 1000000012 |
Base 3 | 1000113 | 1001123 |
Base 4 | 33134 | 100014 |
Base 5 | 14425 | 20125 |
Base 6 | 10516 | 11056 |
Base 7 | 5027 | 5157 |
Base 8 | 3678 | 4018 |
Base 9 | 3049 | 3159 |
Base 10 | 24710 | 25710 |
Base 11 | 20511 | 21411 |
Base 12 | 18712 | 19512 |
Base 13 | 16013 | 16a13 |
Base 14 | 13914 | 14514 |
Base 15 | 11715 | 12215 |
Base 16 | f716 | 10116 |