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prime numbers

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Source: — Problem Solving |
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by tohellandback » Tue Aug 18, 2009 11:58 pm
sum of two prime numbers is a prime numbers.
so one of the prime numbers must be 2.
other we will need to check and I don't think there is any limit

2+3=5 prime
2+5=7
2+11=13
2+17=19
2+29=31
2+41=43
2+59=61
..
and I am sure there are a lot more
The powers of two are bloody impolite!!
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by drnt » Wed Aug 19, 2009 12:14 am
thanks.missed out on typing half the q.
if a,b r two prime numbers then a raised to pwer b is evn,odd always?
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by tohellandback » Wed Aug 19, 2009 12:19 am
drnt wrote:thanks.missed out on typing half the q.
if a,b r two prime numbers then a raised to pwer b is evn,odd always?
if a is 2, then a raised to any power will be even
in all other cases, a raised to b will be odd.

Let me put it like this
except 2, all prime numbers are odd. odd raised to any power is always odd.

2 raised to any power(not 0) will always be even
The powers of two are bloody impolite!!
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