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richie
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26 Dec 2007, 10:39 pm

15
Cardinal 15
fifteen
Ordinal 15th
fifteenth
Numeral system quindecimal
Factorization 3\cdot5
Divisors 1, 3, 5, 15
Roman numeral XV
Roman numeral (Unicode) XV, xv
Binary 1111
Octal 17
Duodecimal 13
Hexadecimal F
Hebrew ט"ו (Tet Vav)

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richie
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26 Dec 2007, 10:43 pm

16
The square of a square....
Anyone for Four-fours?
Cardinal 16
sixteen
Ordinal 16th
sixteenth
Numeral system hexadecimal
Factorization 2^4 \,\!
Divisors 1, 2, 4, 8, 16
Roman numeral XVI
Roman numeral (Unicode) XVI, xvi
Binary 10000
Octal 20
Duodecimal 14
Hexadecimal 10
Hebrew ט"ז (Tet Zayin)

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Last edited by richie on 26 Dec 2007, 11:20 pm, edited 1 time in total.

richie
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26 Dec 2007, 10:49 pm

17 The "Wallpaper number"
Fourth prime of this series Primes of the form n²+n+ 5.
Third prime of this series Primes of the form n²+n+11. And the first of this one: Primes of the form n²+n+17.
Cardinal 17
seventeen
Ordinal 17th
seventeenth
Numeral system septendecimal
Factorization prime
Divisors 1, 17
Roman numeral XVII
Roman numeral (Unicode) XVII, xvii
Binary 10001
Octal 21
Duodecimal 15
Hexadecimal 11

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iamnotaparakeet
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27 Dec 2007, 9:25 am

18
arbitrarily the age a child becomes an adult in the USA
2*3^2 or 6 times 3 or 9 times 2
0001 1000 in Binary Coded Decimal
10010 in binary
12 in hexadecimal
Deciocho
Eighteen

richie
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27 Dec 2007, 11:21 am

****************19***************
Second Prime in this series: Primes of the form n²+n+17.

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iamnotaparakeet
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27 Dec 2007, 11:27 am

20
You are no longer a teenager, but you still don't know what to do with your life... at least in my case....

richie
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27 Dec 2007, 11:37 am

21
A Fibonacci Number and a Triangular Number

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iamnotaparakeet
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27 Dec 2007, 11:43 am

22
Factored: 2*11
Hexadecimal: 16
Binary: 10110
Binary Coded Decimal: 0010 0010
Ventidos
Twenty-two
My current age.

richie
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27 Dec 2007, 11:48 am

Third Prime of Primes of the form n²+n+17. Series.

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iamnotaparakeet
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27 Dec 2007, 11:52 am

BCD: 0010 0100
BIN: 11000
Hex: 18
DEC: 24
Venticuatro
Twenty four.

richie
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27 Dec 2007, 12:09 pm

iamnotaparakeet wrote:

BCD: 0010 0100
BIN: 11000
Hex: 18
DEC: 24
Venticuatro
Twenty four.

24 is also the number of permutations for 4 different objects.

25 A square that is the sum of two consecutive squares:
3²+4²=5² Which also makes it a
Centered Square Number
As demonstrated by: 7²+24²=25² = 49+576=625

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NoNameRockBand
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27 Dec 2007, 1:18 pm

26
I was born on the 26th of Sept.

Ventisei

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richie
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27 Dec 2007, 1:23 pm

27
A cube number.
3³=3X3X3=27

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Flow
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27 Dec 2007, 2:07 pm

2•14=

28

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NoNameRockBand
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27 Dec 2007, 2:11 pm

29

Prime.

Flow
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27 Dec 2007, 2:15 pm

30, the age no woman wants to turn.

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