Fifty One (51)
1. It is a Pentagonal number as well as Centered Pentagonal number.
2. It is the smallest number which can be written with the digits 1 to 5 as the sum of prime numbers. 51 = 2 + 3 + 5 + 41
3. It is the sum of 6 numbers in an AP with common difference 3.
51 = 1 + 4 + 7 + 10 + 13 + 16
4. It is equal to sum of 6 numbers from 6 to 11.
51 = 6 + 7 + 8 + 9 + 10 + 11
5. It is a 18- gonal number.
6. It is the product of two primes.
51 = 3 x 17
7. It is a 6th Motzkin number. For a given number n, Motzkin number is the number of different ways of drawing chords on a circle between n points. It is named after Theodore Motzkin. The first few Motzin numbers are- 1, 2, 4, 9, 21, 51-----
8. The atomic number of Antimony is 71,
Dr Rajesh Kumar Thakur
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