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0 is the additive identity.
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 faces of a regular polygon that is not constructible by straightedge and compass.
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.


4 COMMENTS

  1. Numbers is an excellent video. thanks for the presenter. i am looking forward to use this in my tutoring session.

  2. AMAZING NUMBER NINE,(PIYUSH CONSTANT).
    IT IS VERY INTERESTING ,IT IS MY OWN SEARCH,I LOVE MATHS,IN THE FUTURE VERY SOON MY OWN BOOK ON MATHS WILL PUBLISH MATHS— A STUDY(IN HINDI),OR MAY BE IN THE FORM OF WEBSITE.
    TAKE ANY NUMBER OF DIGITS,HERE I AM TAKING 25 AND 32,NOW
    YOU CAN WRITE THEM IN FOUR WAYS LIKE THAT
    25*32=800
    25*23=575
    52*23=1196
    52*32=1664
    NOW VERY AMAZING,SUBSTRACT BIGGER ONE TO ANY LOWER,ONE BY ONE
    1664-1196=468=4+6+8=­18=1+8=9
    1664-575=1089=1+0+8+­9=18=1+8=9
    1164-800=864=8+6+4=1­8=1+8=9
    1196-575=621=6+2+1=9­­
    1196-800=396=3+6+9=1­8=1+8=9
    800-575=225=2+2+5=9
    ALWAYS NINE,FOR ANY DIGITS,NO BODY CAN COPY ALL RIGITS RESERVED TO PIYUSHDADRIWALA,IT IS JUST MY LOVEY BLOGGERS WHO HAVE INTEREST IN MATHS.LOVE TO ALL
    PIYUSHDADRIWALA
    http://www.piyush-g.741.com­­
    http://www.piyushdadriwalam­aths.co.in

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