user: Problem: By. Ellie Buchdahl. PUBLISHED:. 04:59 EST, 17 September 2013. |. UPDATED:. 08:02 EST, 17 September 2013. The next time you're holding a dollar bill, it might be worth looking further than the big number one - you could get more bang from your buck than you expected. Ordinary low denomination bills are raking in thousands of dollars in an online trend that is centred on the eight-digit serial number which appears on each U.S. banknote. 'Unusual' bills are being bought, sold and hunted on the website CoolSerialNumbers.com,  with low serial numbers, from 00000001 to 00000100, being particularly sought after, a $1 bill with the serial number 00000002 going for $2,500. Mark up: A $1 bill with the serial number F00000001 C would be worth thousands of dollars. The U.S.-based site lists all the different notes that collectors are looking out for and allows serial number fans to get in touch with one another. There are categories such as 'solids' (where the digits repeat eight times), 'ladders' (12345678), 'radars' (01133110 - where the number reads the same left-to-right as right-to-left) and 'repeaters' (20012001 - the second half is the same as the first half). Then there are 'radar repeaters' (12211221), 'super radars' (20000002 - all the internal digits are the same) and 'super repeaters' (where the first two digits are repeated four times, such as 63636363). Big bucks: It may not be worth $99,999,999 dollars - but the serial number means this note is likely to go for a bit more than $5. Prize money: 'Repeaters' and 'super repeaters are also highly regarded on the website CoolSerialNumbers.com. High stakes: If 'trailing nine' of 19999999 is worth $750 on the website, imagine what this prize specimen must have gone for. Dave Undis, the a Nashville musician and currency collector who runs the site, is happy to include some criteria that might go unnoticed to the untrained eye - such as a 'pi note' with the number 31415927. A $5 bill with the number 33333333 is currently up for sale for $13,000, while a set of nine $20 bills running from 00000010 through to 00000090 can be bought for $1,800. A Google+ link on the site allows you to scroll through a full catalogue of unusual serial numbers. The site gets about 5,000 visitors a year, according to Undis, who says he has been collecting currency with 'cool serial numbers' for about 30 years. The U.S. Government introduced numbers onto banknotes in 1928, and has always used eight digits. $1 E 99999995 A                                   $1,500. $1 B 00000002 J                                   $2,500. $1 P 00000004 E                                   $1,250. $1 B 00000004 J                                   $1,000. $1 S 00000003 D                                   $1,000. Set of four notes                                 $5,00099999993-99999996. Source: CoolSerialNumbers.com. So it is particularly unusual to find a banknote without a serial number - and the site regularly sells error notes without serial numbers. Collectors have long been interested in rare and flawed money - and not just in the U.S. In September last year, the Bank of England auctioned £5, £10, £20 and £50 notes with unusual serial numbers - such as those coming at the beginning or the end of a run, often characterised by the prefix A01. In 2009, a batch of 20p pieces that had been minted without the date mark were valued at £50 - with one eBay seller appearing to make £7,100 from the sale of just one coin. And it's not just about money, either - Yo-Yos.net is, as the name suggests, an online community for collectors of Yo-Yos with unusual serial numbers.
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Answer: Website advertises 'fancy serial numbers' for up to $2,500. Low numbers such as 00000001 especially valuable. Flawed banknotes also sought on CoolSerialNumbers.com. Collectors on lookout for obscure numbers - such as 'pi note' 31415927.
Problem: Spain are an unstoppable force in European football. Sevilla beat Benfica in a penalty shootout to win the Europa League Wednesday with La Liga rivals Real Madrid or Atletico Madrid guaranteed to claim the Champions League crown. As an hors d'oeuvre to the mouthwatering final on 24 May, the Europa League provided plenty of drama. Sevilla edged out their Portuguese rivals 4-2 on penalties after a tense 120 minutes of play at the Juventus Stadium in Turin. The Spanish side joined an elite group of teams to have lifted the European trophy three times following their UEFA Cup wins in 2006 and 2007. Benfica have now lost eight European finals -- and the club's peculiar curse continues. After winning the European Cup for a second time in 1962, then manager Bela Guttman was denied a pay rise and promptly declared the club would not succeed on the continent for 100 years. The so-called hex struck again as Benfica tried to lay their ghosts to rest on Italian soil. Jorge Jesus' side had not lost a match on their way to Wednesday's Europa League final while Sevilla had scored 22 goals on their rockier road to the showdown. Despite this goal-scoring prowess, football's first European silverware of the season was decided on penalties after a goalless 90 minutes. Sevilla's lively forward Carlos Bacca and Jose Antonio Reyes had a thrilling series of chances repelled. At the opposite end, Brazilians Lima and Rodrigo forged a potent twin threat for Benefica. Lima forced a fingertip save from Beto when he sent a fizzing long range effort in the Sevilla keeper's direction but the Spaniard's defense held firm -- and the match went into extra time. With another 30 minutes added to the clock, Lima and Bacca once again had the best of the chances. Bacca was put through on goal with a sensational pass from Sevilla captain Ivan Rakitic but the Colombian flicked his left-footed shot wide. It was the last real chance either side had to win the match in regulation play. Lima and Bacca may have struggled to find the back of the net in the final's early stages but both scored as the penalties began in front of the roaring Sevilla fans. Benfica substitute Oscar Cardozo was the first to lose his cool. The experienced forward's hesitant shot was easily collected by Beto. The curse struck again as Rodrigo's stuttering shot was saved. Sevilla's Stephane Mbia,Coke and Spanish international Kevin Gameiro all scored from the spot to see the European trophy join them on the flight back to Spain. Benfica now turn their attention to the Portuguese Cup final where the league champions hope to secure a domestic treble safe in the knowledge that at least on home soil the hex cannot strike again.

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assistant: Sevilla defeat Benfica 4-2 on penalties to win the Europa League in Turin. The Spanish side join an elite group of teams to have lifted the European trophy three times. Benfica's European curse continues as the Portuguese club have now lost eight European finals. Spain will win all European trophies in 2014 as Real Madrid and Atletico Madrid contest Champions League.