 # Have Fun With Math Does Math bore you to death? Not able to understand what x, y and z are doing between numbers? Numbers drive you crazy?

Well, no matter how much you hate Math, I’m sure you will love these interesting facts about it. And if you are already in love with Math, reading these facts, you’ll fall in love all over again. So here we go:

• 8 is the largest cube in the Fibonacci sequence.
• 18 is the only number (other than 0) that is twice the sum of its digits.
• 26 is the only positive number to be directly between a square and a cube (it comes between 5^2=25 and 3^3=27).
• 40 is the only number whose letters are in alphabetical order.
• The number 2519 has an interesting property. Divide it with any number between 2 and 10 (both included), the remainder will be one less than the divisor (the number you are dividing with). Confused? Let’s do it together.
2519 divided by 2 => Remainder is 1
2519 divided by 3 => Remainder is 2 and so on.
• 111,111,111 x 111,111,111 = 12,345,678,987,654,321

I’m sure we have many Math lovers among us. How about sharing with us, some of the interesting facts that you have across? We’ll love to hear from you.

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### 10 Responses to Have Fun With Math

1. Vinayak Nagri September 29, 2010 at 7:50 am #

very nice facts
good work and thanks for sharing 😀

2. Arjun September 29, 2010 at 5:08 pm #

VERY VERY INTERESTING FACTS….

3. Ravi Handa October 2, 2010 at 10:14 am #

1 is the multiplicative identity.
2 is the only even prime.
3 is the number of spatial dimensions we live in.
4 is the smallest number of colors sufficient to color all planar maps.
5 is the number of Platonic solids.
6 is the smallest perfect number.
7 is the smallest number of integer-sided rectangles that tile a rectangle so that no 2 rectangles share a common length.
8 is the largest cube in the Fibonacci sequence.
9 is the maximum number of cubes that are needed to sum to any positive integer.
10 is the base of our number system.
11 is the largest known multiplicative persistence.
12 is the smallest abundant number.
13 is the number of Archimedian solids.
14 is the smallest number n with the property that there are no numbers relatively prime to n smaller numbers.
15 is the smallest composite number n with the property that there is only one group of order n.
16 is the only number of the form xy=yx with x and y different integers.
17 is the number of wallpaper groups.
18 is the only number that is twice the sum of its digits.
19 is the maximum number of 4th powers needed to sum to any number.
20 is the number of rooted trees with 6 vertices.
21 is the smallest number of distinct squares needed to tile a square.
22 is the number of partitions of 8.
23 is the smallest number of integer-sided boxes that tile a box so that no two boxes share a common length.
24 is the largest number divisible by all numbers less than its square root.
25 is the smallest square that can be written as a sum of 2 squares.
26 is the only number to be directly between a square and a cube.
27 is the largest number that is the sum of the digits of its cube.
28 is the 2nd perfect number.
29 is the 7th Lucas number.
30 is the largest number with the property that all smaller numbers relatively prime to it are prime.
31 is a Mersenne prime.
32 is the smallest 5th power (besides 1).
33 is the largest number that is not a sum of distinct triangular numbers.
34 is the smallest number with the property that it and its neighbors have the same number of divisors.
35 is the number of hexominoes.
36 is the smallest number (besides 1) which is both square and triangular.
37 is the maximum number of 5th powers needed to sum to any number.
38 is the last Roman numeral when written lexicographically.
39 is the smallest number which has 3 different partitions into 3 parts with the same product.
40 is the only number whose letters are in alphabetical order.
41 is the smallest number that is not of the form |2x – 3y|.
42 is the 5th Catalan number.
43 is the number of sided 7-iamonds.
44 is the number of derangements of 5 items.
45 is a Kaprekar number.
46 is the number of different arrangements (up to rotation and reflection) of 9 non-attacking queens on a 9×9 chessboard.
47 is the largest number of cubes that cannot tile a cube.
48 is the smallest number with 10 divisors.
49 is the smallest number with the property that it and its neighbors are squareful.
50 is the smallest number that can be written as the sum of of 2 squares in 2 ways.

4. Ravi Handa October 2, 2010 at 10:14 am #

51 is the 6th Motzkin number.
52 is the 5th Bell number.
53 is the only two digit number that is reversed in hexadecimal.
54 is the smallest number that can be written as the sum of 3 squares in 3 ways.
55 is the largest triangular number in the Fibonacci sequence.
56 is the number of reduced 5 x 5 Latin squares.
57 = 111 in base 7.
58 is the number of commutative semigroups of order 4.
59 is the smallest number whose 4th power is of the form a4+b4-c4.
60 is the smallest number divisible by 1 through 6.
61 is the 6th Euler number.
62 is the smallest number that can be written as the sum of of 3 distinct squares in 2 ways.
63 is the number of partially ordered sets of 5 elements.
64 is the smallest number with 7 divisors.
65 is the smallest number that becomes square if its reverse is either added to or subtracted from it.
66 is the number of 8-iamonds.
67 is the smallest number which is palindromic in bases 5 and 6.
68 is the last 2-digit string to appear in the decimal expansion of .
69 has the property that n2 and n3 together contain each digit once.
70 is the smallest abundant number that is not the sum of some subset of its divisors.
71 divides the sum of the primes less than it.
72 is the maximum number of spheres that can touch another sphere in a lattice packing in 6 dimensions.
73 is the smallest number (besides 1) which is one less than twice its reverse.
74 is the number of different non-Hamiltonian polyhedra with minimum number of vertices.
75 is the number of orderings of 4 objects with ties allowed.
76 is an automorphic number.
77 is the largest number that cannot be written as a sum of distinct numbers whose reciprocals sum to 1.
78 is the smallest number that can be written as the sum of of 4 distinct squares in 3 ways.
79 is a permutable prime.
80 is the smallest number n where n and n+1 are both products of 4 or more primes.
81 is the square of the sum of its digits.
82 is the number of 6-hexes.
83 is the number of zero-less pandigital squares.
84 is the largest order of a permutation of 14 elements.
85 is the largest n for which 12+22+32+…+n2 = 1+2+3+…+m has a solution.
86 = 222 in base 6.
87 is the sum of the squares of the first 4 primes.
88 is the only number known whose square has no isolated digits.
89 = 81 + 92
90 is the number of degrees in a right angle.
91 is the smallest pseudoprime in base 3.
92 is the number of different arrangements of 8 non-attacking queens on an 8×8 chessboard.
93 = 333 in base 5.
94 is a Smith number.
95 is the number of planar partitions of 10.
96 is the smallest number that can be written as the difference of 2 squares in 4 ways.
97 is the smallest number with the property that its first 3 multiples contain the digit 9.
98 is the smallest number with the property that its first 5 multiples contain the digit 9.
99 is a Kaprekar number.
100 is the smallest square which is also the sum of 4 consecutive cubes.

5. Anshul October 6, 2010 at 2:56 pm #

Thanks Vinayak. Glad that you found it interesting 🙂

6. Anshul October 6, 2010 at 2:56 pm #

Thanks Arjun 🙂

7. Anshul October 6, 2010 at 2:57 pm #

Thanks a lot Ravi for providing these facts and adding value to the discussion here 🙂

8. medyum cenap hoca October 18, 2010 at 3:04 pm #

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10. huzaifa darbar December 23, 2010 at 9:03 am #

@Anshul, I got no words to say its awesome man
@ravi, really nice collection.

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