I will give best answer to whom ever has the correct answer and shows why.
2007-04-05 07:07:55 · 11 answers · asked by sabby 1 in Science & Mathematics ➔ Mathematics
Since it seems to be unclear, I am not including 1, because to me a prime number is divisible by 1 and itself.
2007-04-05 07:18:31 · update #1
Only 4 of you got it right so far!!!! :)
2007-04-05 08:39:00 · update #2
The first 20 prime numbers are
2,3,5,7,11
13,17,19,23,29
31,37,41,43,47
53,59,61,67,71.
Their sum is 639.
To clear up confusion about 1.
1 is NOT considered a prime number, even
though its only factors are 1 and itself.
Why?
Recall the unique factorisation rule.
Every positive integer greater than
1 has a decomposition into prime
factors. This decomposition is unique
except for the order of the factors.
If 1 were a prime the uniqueness
would no longer hold and each
integer would have infinitely many
decompositions into prime factors.
Example: 30 = 2*3*5.
If 1 were prime, we could write
30 = 2*3*5*1= 2*3*5*1*1...,
with as many 1's at the end as we please
and have as many different factorisations as we please.
2007-04-05 07:30:10 · answer #1 · answered by steiner1745 7 · 2⤊ 0⤋
569 or 639, depending on whether you consider 1 to be a prime number. (Some people say yes, because it has no factors other than one and itself; others say no, because a prime number has two factors and 1 has only one.)
The first 20 prime numbers: 1(?), 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71 (?)
2007-04-05 07:13:32 · answer #2 · answered by Amy F 5 · 2⤊ 1⤋
2+3+5+7+11+13+17+19+23+29+31+
37+41+43+47+53+59+61+67+71
=
639
2007-04-05 07:12:53 · answer #3 · answered by A5H13Y 4 · 3⤊ 0⤋
The first 20 prime numbers are : 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71. Their total
is : 629 A prime number has 2 factors only, 1 and itself. When I submit, it doesn't continue the list from 37-71.
2007-04-05 07:24:39 · answer #4 · answered by The Count 7 · 0⤊ 2⤋
639
2007-04-05 07:14:55 · answer #5 · answered by Rohan shah 1 · 1⤊ 0⤋
nothing special...but i can assure u that if u name the sum, A,
then:
(A + 1) would definitely be a composite number
( coz : 2 + (sum of 19 odd numbers) + 1 = even + odd + odd = even , which is a composite number )
you know,if u asked for the first 400 numbers of something,i would make an effort,but u can easily get this number by your bare hands! good luck!
2007-04-05 08:23:37 · answer #6 · answered by farbod f 2 · 0⤊ 1⤋
2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,
2+3+5+7+11=28
13+17+19+23+29=101
31+37+41+43+47=199
53+59+61+67+71= 311
28+101+199+311=639
2007-04-05 09:16:30 · answer #7 · answered by Dave aka Spider Monkey 7 · 1⤊ 0⤋
637
2007-04-05 07:11:13 · answer #8 · answered by rohan c 1 · 0⤊ 2⤋
your mom....
1+3+5+7+11+13+17+19+23+29+31+37+39+41+43+47+51+53+59+61= 590
and wow im gay for doing that-- and you're gay for asking.
2007-04-05 07:13:21 · answer #9 · answered by Im Holden McGroyen 2 · 0⤊ 5⤋
Seriously? Get a calculator and add them together...
2007-04-05 07:11:17 · answer #10 · answered by b 2 · 0⤊ 1⤋