2 problems

Let $H(n,q,s,a)$ denote a Helberg code with length $n$, alphabet size $q$, deletion parameter $s$, and residue $a$. Let $a$ be the residue corresponding to the maximum number of co…

Let $VT_{(a,b)}(n;4)$ be a quaternary Varshamov–Tenengolts code, let $\phi$ be a Naisargik map, and let $D_1(X)$ denote the set of binary sequences obtained from $X$ by one deletio…