I just wrote: > a = -95 {2264832171464196191} > a = -37 {361, 2264832171464196133} > a = -23 {2264832171464196119} > > Might there be a larger region? To partially answer my own query, I suppose what makes the above "region" special is that 2264832171464196096 is a product of even powers of 2, 3, (5) and 7 with the only zero-digit near the end. :)