Count to a million (in prime numbers!)

actuallylike · 25-03-2009 2:10pm #1

Let's get nerdy people, same rules apply as the count to a million thread but in prime numbers only. In case you don't know, a prime number is divisible only by itself and 1 (ie 7 or 13, etc.).

There's plenty of prime number calclators on the web
example http://www.easycalculation.com/prime-number.php
if stuck but try it in your head first

I'll start by skipping 1 and 2 and onto

3

colrow · 25-03-2009 2:56pm

amy12 · 25-03-2009 2:57pm

colrow · 25-03-2009 2:59pm

25-03-2009 3:01pm

walshb · 25-03-2009 3:03pm

15

Ha!

colrow · 25-03-2009 3:09pm

walshb wrote: »

15

Ha!

Stupid Boy !!!!!!!!!!!!!!

17

Queen-Mise · 25-03-2009 3:30pm

Capt'n Midnight · 25-03-2009 3:37pm

Queen-Mise · 25-03-2009 3:54pm

triple-M · 25-03-2009 3:55pm

Queen-Mise · 25-03-2009 3:58pm

amy12 · 25-03-2009 4:02pm

poisonated · 25-03-2009 4:04pm

amy12 · 25-03-2009 4:14pm

43:cool:

Queen-Mise · 25-03-2009 4:17pm

47

39 isn't prime, it is divisible by 3

colrow · 25-03-2009 4:35pm

Queen-Mise · 25-03-2009 4:37pm

RangeR · 26-03-2009 5:12pm

Capt'n Midnight · 26-03-2009 6:43pm

Sixty-one is a cuban prime of the form p = (x3 − y3) / (x − y),x = y + 1.

Sixty-one is the largest know prime that divides the product of the next two primes plus 1.

Sixty-one is the sum of two squares
it is a centered square number,
a centered hexagonal number and
a centered decagonal number.

it is a Pillai prime.
It is also a Keith number,

colrow · 26-03-2009 6:49pm

Queen-Mise · 26-03-2009 11:52pm

71

I think, havent checked online

blindman · 27-03-2009 12:41am

Richard · 27-03-2009 12:46am

colrow wrote: »

49

49 isn't prime. It is 7x7.

Also, OP, 1 isn't prime either.

79 is, however.

magicianz · 27-03-2009 12:51am

83!

blindman · 27-03-2009 12:51am

magicianz · 27-03-2009 12:52am

blindman wrote: »

81

81 is 9x9! Check and mate ;-)

drunkmonkey · 27-03-2009 12:53am

(83,89) Sexy Primes if i'm not mistaken:)

Capt'n Midnight · 27-03-2009 2:45am

magicianz wrote: »

83!

Factorial 83 is not prime.

97

http://primes.utm.edu/lists/small/millions/

Matt Holck · 27-03-2009 4:03am

You asked me once, what was in Room 101. I told you that you knew the answer already. Everyone knows it. The thing that is in Room 101 is the worst thing in the world.

http://en.wikipedia.org/wiki/Room_101

Queen-Mise · 27-03-2009 11:52am

101

cullig_jp · 27-03-2009 12:03pm

103

Queen-Mise · 27-03-2009 12:19pm

107

1mcampo1 · 27-03-2009 3:00pm

109

Queen-Mise · 27-03-2009 5:43pm

113

1mcampo1 · 27-03-2009 6:27pm

127

Queen-Mise · 27-03-2009 6:40pm

131

Richard · 29-03-2009 7:55pm

137

Queen-Mise · 30-03-2009 12:38am

139

Capt'n Midnight · 30-03-2009 12:59am

1 / 0.0067114093959731543624161073825503355704697986577181208053691275167785234899328859060402684563758389261744966442953020134228187919463087248322147651 -Recurring

Queen-Mise · 30-03-2009 8:35am

149

banquo · 01-04-2009 2:08am

This is all very distressing.

151.

banquo · 01-04-2009 2:10am

banquo wrote: »

A German eye specialist with a keen amateur interest in mathematics has discovered the world's largest prime number after a 50-day search using his personal computer.

Dr Martin Nowak, who has his own practice in the south German town of Michelfeld, stumbled upon the number last week, breaking the previous record for a prime number by half a million digits.

Prime numbers are divisible only by themselves and 1. While the first prime numbers 2, 3, 5, and 7, are easy to identify, Dr Nowak's monster prime number is more than 7.8m digits long and is written as 2 to the 25,964,951st power minus 1.

The number belongs to a special class of rare prime numbers known as Mersenne primes, named after a 17th century French monk who first studied them 350 years ago. So far only 42 have been found.

Yesterday Dr Nowak was reluctant to talk about his discovery, made using a special programme on his 2.4GHz Pentium 4 computer. "He's busy. He has a full afternoon seeing patients. He's doesn't want to comment," a spokeswoman at Dr Nowak's clinic said.

The eye surgeon is one of thousands of volunteers using software provided by the Great Internet Mersenne Prime Search (Gimps), a project to discover the holy grail of prime number research - a 10m-digit prime number. It took experts five days to work out that Dr Nowak's new number was indeed bigger than the previous biggest prime, discovered last May by an American. His number has 7,816,230 digits.

http://www.guardian.co.uk/science/2005/mar/02/sciencenews.germany

Matt Holck · 01-04-2009 2:13am

157

Queen-Mise · 02-04-2009 11:58am

163

actuallylike · 13-05-2009 12:59pm

167

namenotavailablE · 13-05-2009 9:27pm

173

Luap · 13-05-2009 9:49pm

179

Queen-Mise · 13-05-2009 10:25pm

181

lintdrummer · 19-05-2009 2:31am

How can you count to 1 million in prime numbers when 1 million isn't prime?

This seems futile but:

191

actuallylike · 19-05-2009 2:28pm

emmettogara wrote: »

How can you count to 1 million in prime numbers when 1 million isn't prime?191

Fair point, 1000003 it is!

emmettogara wrote: »

This seems futile but:

You're absolutely right, completely futile...but...

193

Count to a million (in prime numbers!)

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