Burt Kaliski Jr. (@modulomathy)
3/26/12 8:55 AM
#math trivia for #March26: #86 is two times a prime. How often does this happen in a leap year? (Including 2*2=4.)
The equivalent question is, how many primes are between 1 and 183?
This value is denoted π(183), the number of primes less than or equal to 183. According to Wolfram Alpha (or any calculation), the number of such primes is 42.