 |
28999999999 (another Prime Pages' Curiosity) |
|
|
|
Curios:
Curios Search:
Participate: 
|
The smallest prime for which the sum of the squares of its digits is also a prime throughout 5 iterations (6 "generations"): 28999999999 -> 797 -> 179 -> 131 -> 11 -> 2. Terry Trotter called this type of prime a "father" prime, and the subsequent sums (797, 179, 131, 11, 2) "child" primes. Is there a 7-generation father prime to be found? [Ganson]
Prime Curios! © 1999-2010 (all rights
reserved)
|