For learning purposes, how to get the RSA's parameters (I use standard notation):
$n = p q $, where $p$ and $q$ are prime and $e$, $d$, such that $ed = 1 \ (mod\ \varphi (n)) $ when doing
ssh-keygen -t rsa -b 2048
i.e. how to get those parameters from the output:
----BEGIN PRIVATE KEY---- F2847XAPM... ... ----END PRIVATE KEY----
Note: this question is the reverse of What data is saved in RSA private key?: how to recover these parameters from the keys produced by
ssh-keygen -t rsa -b 2048 (and not how to ask sshkeygen or openssl to output them from the start).