Geek Secret Pin Numbers

Everyone has their own technique to create their "secret" pin numbers, but if you're a geek, here are some interesting references you're likely to find amusing.

• 0042 - The answer to the ultimate question of life, the Universe and everything else
• 1701 - NCC-1701, a.k.a. Star Trek's Enterprise.
• 1138 - Apparently one of George Lucas favorite numbers.
• 1969 - the only number under 1,000,000 for which the standard Mod-N Ackermann function doesn't stabilize (go figure that one out...)
• 1337 - Spells LEET in Leet speak.
• 3435 - The only four digit Munchausen number (a number that is equal to the sum of its digits each raised to a power equal to the digit.)
• 
• 5141 - the only four digit number that is reversed in hexadecimal (0x1415)
• 6174 - Kaprekar's constant
  
  
  1. Take any four-digit number, using at least two different digits. (Leading zeros are allowed.)
  2. Arrange the digits in ascending and then in descending order to get two four-digit numbers, adding leading zeros if necessary
  3. Subtract the smaller number from the bigger number
  4. Go back to step 2
  You will always reach 6174 in at most 7 iterations.

[via SpikedMath]