e/Base 13

Information
has gloss	eng: Base-13, tridecimal, or tredecimal is a positional numeral system with thirteen as its base. It uses 13 different digits for representing numbers. Suitable digits for base 13 could be 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, X, E, and T (similar to base 12) or 0-9, A, B, and C (similar to base 16). Base 13 in fiction In the end of The Restaurant at the End of the Universe by Douglas Adams, a possible question to get the answer "forty-two" is presented: "What do you get if you multiply six by nine?" Of course, the answer is deliberately wrong, creating a humorous effect – if the calculation is carried out in base 10. People who were trying to find a deeper meaning in the passage soon noticed that in base 13, 613 × 913 is actually 4213 (as 4 × 13 + 2 = 54). When confronted with this, the author stated that it was a mere coincidence, and that "I don't write jokes in base 13." See also The Answer to Life, the Universe, and Everything.
lexicalization	eng: base 13
lexicalization	eng: Base-13
instance of	(noun) a numeration system in which a real number is represented by an ordered set of characters where the value of a character depends on its position positional notation, positional representation system