На компьютере легко считается, ряды расходящиеся. Суммирование Рамануджана, как описано
здесьWiki писал(а):
More recently, the use of

has been proposed as Ramanujan's summation, since then it can be assured that one series admits one and only one Ramanujan's summation, defined as the value in 1 of the only solution of the difference equation

that verifies the condition

.
в пакете математика тоже посчитать несложно.