jueves, 8 de octubre de 2009

Criba de Eratóstenes



La criba de Eratóstenes es un algoritmo que permite hallar todos los números primos menores que un número natural dado N. Se forma una tabla con todos los números naturales comprendidos entre 2 y N y se van tachando los números que no son primos de la siguiente manera: cuando se encuentra un número entero que no ha sido tachado, ese número es declarado primo, y se procede a tachar todos sus múltiplos. El proceso termina cuando el cuadrado del mayor número confirmado como primo es mayor que N.

Da click en la imagen, y la comprenderas mejor

3 comentarios:

Anónimo dijo...

Whats up people

I just wanted to say hi to everyone

Byebye

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Anónimo dijo...

In 1959 phentermine first received approval from the FDA as an appetite suppressing drug. Phentermine hydrochloride then became available in the early 1970s. It was previously sold as Fastin from King Pharmaceuticals for SmithKline Beecham, however in 1998 it was removed from the market. Medeva Pharmaceuticals sells the name brand of phentermine called Ionamin and Gate Pharmaceuticals sells it as Adipex-P. Phentermine is also currently sold as a generic. Since the drug was approved in 1959 there have been almost no clinical studies performed. The most recent study was in 1990 which combined phentermine with fenfluramine or dexfenfluramine and became known as Fen-Phen.[citation needed]
In 1997 after 24 cases of heart valve disease in Fen-Phen users, fenfluramine and dexfenfluramine were voluntarily taken off the market at the request of the FDA. Studies later proved that nearly 30% of people taking fenfluramine or dexfenfluramine had abnormal valve findings. The FDA did not ask manufacturers to remove phentermine from the market.
[url=http://www.buyphentermine1.com]cheap phentermine[/url] Phentermine is still available by itself in most countries, including the U.S. However, because it is similar to amphetamines, it is classified as a controlled substance in many countries (including Australia). Internationally, phentermine is a schedule IV drug under the Convention on Psychotropic Substances.[1] In the United States, it is classified as a Schedule IV controlled substance under the Controlled Substances Act.
Looking forward, Phentermine is being studied with another medication for obesity. The experimental appetite suppressant drug Qnexa is a mixture of Phentermine and Topiramate.
Phentermine, in doses clinically used, works on the hypothalamus portion of the brain to release norepinephrine, a neurotransmitter or chemical messenger that signals a fight-or-flight response, reducing hunger. Phentermine works outside the brain as well to release epinephrine or adrenaline causing fat cells to break down stored fat, but the principal basis of efficacy is hunger-reduction. At high doses, phentermine releases serotonin and dopamine as well, but such doses are never used in clinical medicine.
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Anónimo dijo...

That just about wraps it up. My collection of the very best centre forwards to kick a ball for Manchester Utd before Ferguson's days. Are you wondering why I decided to only include pre-Ferguson players in this list? Actually it's simply because I feel the forwards that have been at Utd during Alex Ferguson's lengthy leadership in charge of United require a write up all to themselves. Sir Alex Ferguson hasn't been short of forwards to chose from. There is a good chance this wont be my last word on the issue. A piece on the strikers who played for Alex may be on the cards. manchester united [url=http://www.pulsebet.com]arsenal football[/url] Among Manchester’s other professional sports teams are the Wigan Warriors of the Rugby League, the Salford City Reds, the Oldham Roughyeds, Rochdale Hornets, Swinton Lions, Sale Sharks, Belle Vue Aces, Manchester Phoenix and others. [url=http://www.pulsebet.com]wayne rooney[/url] Back in the Newton Heath era, the kits were made up of yellow and green stitched sections (1878 - 1892), and looked a bit like a jockey's silks. Some additional colour schemes were also employed such as a red and white shirt (1892-1894) paired with blue shorts. This all changed in 1902 when the club changed its name to Manchester United, the club radically altered the kit colours to red shirts, white shorts and black socks. This colour palette has been the foundation of the home strip ever since. The away strip is white jerseys, black shorts and white socks however different looks to this strip have existed. The most notorious of these was the all-grey strip employed in the 1995-1996 campaign. The club did not win a single game when sporting the grey shirts. The team were vociferous in their claims that the drab colour meant they had difficulty seeing their team-mates, hence passes were being sprayed all over the pitch! Another variation was the all-black kit used in 1994 and 2003. There is also a "Third Strip". This shirt which is not often used, is an homage to the kit worn when the club won the 1968 European Cup. The team has occasionally used the strips employed for training sessions in actual matches although this has been a rare occurence.