12357
This number is a composite.
The concatenation of the 5 non-composite positive digits is a π(5)-almost prime p. Note that π(p) is also a π(5)-almost prime. [Worrom]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Reginald McLean
This number is a composite.
The concatenation of the 5 non-composite positive digits is a π(5)-almost prime p. Note that π(p) is also a π(5)-almost prime. [Worrom]