484 and all that

Outside a nearby apartment house, I spotted a home-made "for rent" sign that gave the landlord's phone number. It consisted of nothing but the digits 4 and 8. It was as if it was a 10-digit binary code, but with 4s and 8s instead of 0s and 1s. There were no hyphens, no spacing, nothing to help the prospective tenant remember the number by "chunking" it into smaller pieces. You'd have to stop and write it down digit by digit or snap a photo of it, tough to do at a busy intersection. If the landlord doesn't get any phone calls, he or she will probably blame the economy.