Prime Numbers
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Numbers
Compare 13 vs 181
Compare 13 vs 181
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vs
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Property
13
181
Type
prime
prime
Unique factors
1
1
Total factors
1
1
Prime factorization
13
1
181
1
Prime factorization
13
181
Divisors count
2
2
Divisors
1
,
13
1
,
181
Number of properties
32
8
Centered square primes
2nd
6th
Chen primes
6th
33rd
Cousin primes
(1st member)
3rd
Cuban primes 2
1st
Dihedral primes
5th
Emirps
1st
Fibonacci primes
4th
Happy primes
2nd
Harmonic primes
2nd
Left-truncatable primes
5th
Long primes
16th
Lucky primes
3rd
Multiplicative primes
5th
Palindromic primes
9th
Pierpont primes
5th
Primes
6th
42nd
Prime quadruplets
(2nd member)
2nd
Prime quadruplets
(4th member)
1st
Prime quintuplet 1s
(3rd member)
1st
Prime quintuplet 2s
(2nd member)
2nd
Prime quintuplet 2s
(4th member)
1st
Prime sextuplets
(3rd member)
1st
Prime triplets
(1st member)
4th
Prime triplets
(2nd member)
3rd
Prime triplets
(3rd member)
2nd
Proth primes
3rd
Pythagorean primes
2nd
19th
Sexy primes
(1st member)
4th
Sexy primes
(2nd member)
2nd
Sexy prime triplets
(2nd member)
2nd
Solinas primes
5th
Thabit primes of the 2nd kind
2nd
Twin primes
(2nd member)
3rd
13th
Ulam primes
4th
Wilson primes
2nd
Roman numberals
XIII
CLXXXI
Base 2
1101
2
10110101
2
Base 3
111
3
20201
3
Base 4
31
4
2311
4
Base 5
23
5
1211
5
Base 6
21
6
501
6
Base 7
16
7
346
7
Base 8
15
8
265
8
Base 9
14
9
221
9
Base 10
13
10
181
10
Base 11
12
11
155
11
Base 12
11
12
131
12
Base 13
10
13
10c
13
Base 14
d
14
cd
14
Base 15
d
15
c1
15
Base 16
d
16
b5
16
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