
Curios:
Curios Search:
Participate: 
217 is the smallest odd pseudoprime base five. 47 and 89 are primes, as is their concatenation (4789). Inserting the lowly 0 between them transforms the prime into a power, i.e. 47089, the square of 217. [Trotter]
Prime Curios! © 20002018 (all rights
reserved)
