71

71
Basic Information
Cardinal Number	seventy-one
Ordinal Number	seventy first
Roman Numeral	LXXI
Greek Numeral	ΟΑ´
Factorization	71
Different Representations
Binary Form	10001112
Ternary Form	21223
Quaternary Form	10134
Quinary Form	2415
Senary Form	1556
Septenary Form	1317
Octal Form	1078
Nonary Form	789
Undecimal Form	6511
Duodecimal Form	5B12
Tridecimal Form	5613
Quattuordecimal Form	5114
Quindecimal Form	4B15
Hexadecimal Form	4716
Septendecimal Form	4317
Octodecimal Form	3H18
Novemdecimal Form	3E19
Vigesimal Form	3B20
Unvigesimal Form	3821
Duovigesimal Form	3522
Trevigesimal Form	3223
Quattuorvigesimal Form	2N24
Quinvigesimal Form	2L25
Hexavigesimal Form	2J26
Septenvigesimal Form	2H27
Octovigesimal Form	2F28
Novemvigesimal Form	2D29
Trigesimal Form	2B30
Untrigesimal Form	2931
Duotrigesimal Form	2732
Tretrigesimal Form	2533
Quattuortrigesimal Form	2334
Quintrigesimal Form	2135
Hexatrigesimal Form	1Z36
Previous	[[67]]
Current	71
Next	[[73]]

71 is a prime number from 1-100. 71 has 2 factors, 1 and 71. It is the twentieth prime number, and the twentieth prime number from 1-100.

Proofs

• 1 can divide 71
• 2 cannot
• 3 cannot
• 4 - 70 cannot
• 71 can!

Relationship with other odd numbers

The numbers before

• The previous odd number, 69, is not a prime number. It is divisible by 3.
• The odd number previous to 69 is 67. 67 is a prime number.
  • 67 and 71 are four numbers apart; therefore, they are cousin primes.
• The odd number previous to 67 is 65. 65 is not a prime number. It is divisible by 5.

The numbers after

• The next odd number, 73, is a prime number.
  • There are no odd numbers between 71 and 73. As a result, they are twin primes.
• 75, the odd number following 73, is not a prime number. It is divisible by 5.
• 77, the odd number following 75, is also not a prime number. It is divisible by 7.
• 79 is the next prime number after 73.

Prime Numbers 1-1,000