Importance of Eight
(8)
1.
It is a
composite number with its proper divisor being 1, 2 and 4.
2.
It is the base
of the octal number system. In octal number system one digit represents 3 bits.
3.
The atomic
number of oxygen is eight.
4.
Scorpio is the 8th
astrological sign of the Zodiac.
5.
A map consists
of 8 directions:- North, Northeast, Northwest, East, Southeast, Southwest,
West, South.
6.
In three
dimensional spaces there are 8 octants and the eight octants have the different
co-ordinates shown here.
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7.
Apart from the
trivial cases of 0 and 1, 8 is the smallest number for which the sum of the
digits of its cube is equal to the number.
83 = 512
and 5 + 1 + 2 = 8
8.
It is the
largest cube in the Fibonacci sequence. A Fibonacci number is a numbers in
which the next number is the sum of previous two. 1, 1, 2, 3, 5, 8… are the
numbers of the Fibonacci sequence.
9.
It is the second
cube number. 23 = 8
10. One can split a pie into 8 pieces with three
straight cuts.
11. A cube or cuboids has 8 vertices.
12. An umbrella is octagonal in shape.
13. The digital sum of a prime pair product is 8.
5
x 7 = 35 and 3 + 5 = 8
11
x 13 = 143 and 1 + 4 + 3 = 8
17
x 19 = 323 and 3 + 2 + 3 = 8
29 x 31 =
899 and 8 + 9 + 9 = 26 and 2+ 6 = 8
14. A number is divisible by 8 if it ends with 000 or
its last three digit is divisible by 8.
Example – 1000, 456640
15. Many spiders, bees and flies have eight legs.
16. Eight is the third number that remains the same
written upside down.
17. The amount of cloud in the sky is measured in oktas
on a scale from zero to eight. 8 oktas means the sky is totally clouded.
18. It is the second honest number.
23
= Two Cubed = 8 has eight letters.
19. It is the smallest sum of two factorials of distinct
primes.
2!
+ 3! = 2 + 6 = 8
20. It is the only cube that is 1 less than a square.
8 = 32 – 1
21. Digit sum of prime pair product comes out 8.
5
x 7 = 35 and 3 + 5 = 8
11
x 13 = 143 and 1 + 4 + 3 = 8
17
x 19 = 323 and 3 +
2 + 3 = 8
22. Eight can be portioned in 22 ways.
23. 8 times any triangular number is 1 less than a square.
1, 3, 6, 10,… are the examples of triangular number. If we take 3 as a
triangular number than 8x 3 = 24 is 1 less than 25 which is a square number.
24. It is the second octagonal number represented by the
formula n(3n – 2 ), where n is any natural number. The sequence is 1, 8, 21, 40….
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