Colbert Number

A Colbert number is any prime number with more than decimal digits whose discovery contributes to the long-sought after proof that is the smallest Sierpiński number of the second kind. Colbert Numbers are named to honor Stephen T. Colbert.

There are currently five known Colbert numbers, as summarized in the following table.

Colbert number decimal digits 1521561 3918990 2759677 2357207 2116617

The Seventeen or Bust distributed computing effort is conducting a search for the remaining six Colbert numbers (where indicates the exponent is unknown).