Sixty Eight (68)
1. It is the smallest composite number that becomes prime by turning it upside down. 68 turning upside down gives 89 which in a prime number.
2. It is the sum of 8 consecutive numbers beginning from 5.
68 = 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12
3. It is a Truncated Tetrahedral number.
4. There are exactly 68 ten digit binary numbers in which each digit is the same as one of it's adjacent digits.
5. The atomic number of Erbium is 68.
6. 68 is the largest known number to be the sum of two primes in exactly two different ways:
68 =7+61
=31+37.
7. In a normal distribution around 68% of value are within one standard deviation away from the mean.
DR RAJESH KUMAR THAKUR
rkthakur1974@gmail.com
1. It is the smallest composite number that becomes prime by turning it upside down. 68 turning upside down gives 89 which in a prime number.
2. It is the sum of 8 consecutive numbers beginning from 5.
68 = 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12
3. It is a Truncated Tetrahedral number.
4. There are exactly 68 ten digit binary numbers in which each digit is the same as one of it's adjacent digits.
5. The atomic number of Erbium is 68.
6. 68 is the largest known number to be the sum of two primes in exactly two different ways:
68 =7+61
=31+37.
7. In a normal distribution around 68% of value are within one standard deviation away from the mean.
DR RAJESH KUMAR THAKUR
rkthakur1974@gmail.com
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