São Tomé and Príncipe

#190 of 193 countries

726866326377462473

That piece first turns up at decimal place 30,346,117,731 of π (about 30.3 billion digits in).

São Tomé and Príncipe is 18 digits on the keypad. We look up at most 10 digits at a time, so it is ranked by its longest piece we found: the 10 digits 7268663263.