172
(another Prime Pages' Curiosity)
Prime Curios!
Curios: Curios Search:
 
Participate: 		+ 172 is the only byte whose binary representation contains a 1 at bit n iff n is prime (17210 = 101011002). [Thoms]

+ Seventeen 2's followed by two 17's is prime. [De Geest]

+ 172 = pi(1+7+2) * prime(1*7*2). It is the only known number (up to 10^8) with this property. [Firoozbakht]

+ 172 = phi(1+7+2) * prime(1*7*2). It is the only known number (up to 10^8) with this property. [Firoozbakht]



Prime Curios! © 1999-2009 (all rights reserved)