About the Number 14 (fourteen)

MathBabbler noticed he didn't have a nBAB for the number 14 even though Pi Day occurs every March 14th.

   MathBabbler Number Analyst (MBNA) output:
   =========================================
   14 is a natural, whole, integer
   14 is even
   14 proper divisors are: 1,2,7,
   14 is deficient (sum of divisors is 10)
   14 is unhappy
   14 is not a Harshad number
   14 is not prime
   14 is undulating
   14 has the prime factors: 2*7
   14 is semiprime (biprime or 2-almost prime)
   14 in octal is 016
   14 in hexadecimal is 0xe
   14 in binary is 1110 (is odious)
   14 nearest square numbers: -5...2 (9...16 [4])
   sqrt(14) = 3.74166
   ln(14) = 2.63906
   log(14) = 1.14613
   14 reciprocal is .07142857142857142857142857142857
   14! is 8.71783e+10
   14 is 4.45634 Pi years
   14 is 0 score and 14 years
   14 written as a Roman numeral is XIV

[Wikipedia] 14 is a square pyramidal number because if the sum of the first three square numbers.

   1^2 + 2^2 + 3^2 = 14

   generalized:  n(n+1)(2n+1)/6

The first few square pyramidal numbers are...

   1, 5, 14, 30, 55, 91, 140, 204, 285, 385, 506, 650, 819

OEIS.org::id:A000330

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 17 March 2009