https://mathweb.ru/allsystem.html?id=335172

Сложить 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000(27) и 1000000000000000000000000000000000(27) = 100000000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000 Столбиком

Введите два числа и укажите их основание системы счиления:
+100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
1000000000000000000000000000000000
100000000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000
Ответ: 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000027 + 100000000000000000000000000000000027 = 10000000000000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000027