`10^a + 10^b + 10^c + 1`

, resulting in numbers that have a digitsum equal to 4. Numbers in bold are also prime when the prime is interpreted as a base-2 number.

`10^a + 10^b + 10^c + 1`

, resulting in numbers that have a digitsum equal to 4. Numbers in bold are also prime when the prime is interpreted as a base-2 number.