Thirty (30)
1. It is the product of first three prime numbers.
30 = 2 x 3 x 5
2. It is the sum of first fours square number.
30 = 1^2 + 2^2 + 3^2 + 4^2
3. It is a Pyramidal number. A pyramidal number is a figurative number that represents a pyramid with a base and a given number of sides.
4. It is the largest number such that every smaller co prime to it is a prime.
5. Dodecahedron and Icosahedrons both have 30 edges.
Dodecahedron Icosahedron
6. A polygon with 30 sides is called a tricontagon.
7. It is a Harshad number because 30 is divisible by the sum of its digit 3 + 0 = 3.
8. The atomic number of zinc is 30.
9. It is the area of right angle triangle with side 5, 12 and 13. It also has the perimeter 30.
10. It is the 5th abundant number.
11. N^5 – N is divisible by 30.
12. It is a round number. A number (n) is said to be a round number if it has no prime factor greater than square root n.
Enjoy reading
Dr Rajesh Kumar Thakur
rkthakur1974@gmail.com
1. It is the product of first three prime numbers.
30 = 2 x 3 x 5
2. It is the sum of first fours square number.
30 = 1^2 + 2^2 + 3^2 + 4^2
3. It is a Pyramidal number. A pyramidal number is a figurative number that represents a pyramid with a base and a given number of sides.
4. It is the largest number such that every smaller co prime to it is a prime.
5. Dodecahedron and Icosahedrons both have 30 edges.
Dodecahedron Icosahedron
6. A polygon with 30 sides is called a tricontagon.
7. It is a Harshad number because 30 is divisible by the sum of its digit 3 + 0 = 3.
8. The atomic number of zinc is 30.
9. It is the area of right angle triangle with side 5, 12 and 13. It also has the perimeter 30.
10. It is the 5th abundant number.
11. N^5 – N is divisible by 30.
12. It is a round number. A number (n) is said to be a round number if it has no prime factor greater than square root n.
Enjoy reading
Dr Rajesh Kumar Thakur
rkthakur1974@gmail.com
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