  Let $b$ be a numeration base. A $b$-additive Ramanujan-Hardy number $N$ is an
integer for which there exists at least an integer $M$, called additive
multiplier, such that the product of $M$ and the sum of base $b$ digits of $N$,
added to the reversal of the product, gives $N$. We show that for any $b$ there
exists an infinity of $b$-additive Ramanujan-Hardy numbers and an infinity of
additive multipliers. A $b$-multiplicative Ramanujan-Hardy number $N$ is an
integer for which there exists at least an integer $M$, called multiplicative
multiplier, such that the product of $M$ and the sum of base $b$ digits of $N$,
multiplied by the reversal of the product, gives $N$. We show that for an even
$b$, $b\equiv 1 \pmod {3}$, and for $b=2$, there exists an infinity of
$b$-multiplicative Ramanujan-Hardy numbers and an infinity of multiplicative
multipliers.
  These results completely answer two questions and partially answer two other
questions among those asked in V. Ni\c{t}ic\u{a}, \emph{About some relatives of
the taxicab number}, arXiv:1805.10739v4.
