Paul Graham on Twitter: "What is the next number in this sequence? 16, 17, 18, 18, 20, 19, _

Country	Code	For customers of
United States	40404	(any)
Canada	21212	(any)
United Kingdom	86444	Vodafone, Orange, 3, O2
Brazil	40404	Nextel, TIM
Haiti	40404	Digicel, Voila
Ireland	51210	Vodafone, O2
India	53000	Bharti Airtel, Videocon, Reliance
Indonesia	89887	AXIS, 3, Telkomsel, Indosat, XL Axiata
Italy	4880804	Wind
3424486444	Vodafone
» See SMS short codes for other countries

1. Ajdin Dautović‏ @AjdinDautovic 14 Jan 2015
  Replying to @paulg
  
  @paulg 20. I win
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1. Steven Johns‏ @stevenjohns 14 Jan 2015
  Replying to @paulg
  
  @paulg 22?
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1. br◎seph‏ @on3ness 14 Jan 2015
  Replying to @paulg
  
  @paulg Choices: 20, 21, 22, 23.
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1. HoffPost, LLC‏ @_hoffman 14 Jan 2015
  Replying to @paulg
  
  @paulg 42
  
  1 like
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1. Bruce Hoult‏ @BruceHoult 14 Jan 2015
  Replying to @paulg
  
  @paulg I can give you a watertight reason for it to be any of those numbers, or any other number you want.
  
  4 likes
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1. Michael Nirschl‏ @mikeinertia 14 Jan 2015
  Replying to @paulg
  
  @paulg 22
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1. CITIZENHUSH ❁‏ @citizenhush 14 Jan 2015
  Replying to @paulg
  
  @paulg "95% of people can't answer this question- but this 6 year old can! Can you?"
  
  4 likes
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1. Spring of Slight Promise‏ @kreylix 14 Jan 2015
  Replying to @paulg
  
  @paulg 22
  
  2 likes
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1. Matias Koretzky‏ @matiaskoretzky 14 Jan 2015
  Replying to @paulg
  
  @paulg 21
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1. Kohzy‏ @kohzy 14 Jan 2015
  Replying to @paulg
  
  @paulg 22
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