Construct Big Integers with odd digits only

New to Julia
,
3

I’m not a 100% sure I understood what you are trying, but here’s a way to increment a number in a odd-digit way:

function incr2!(v::AbstractVector{Int})
    for i in reverse(eachindex(v))
        v[i] = mod1(v[i]+2, 10)
        if v[i] != 1
            break
        end
    end
    return v
end

julia> v = MVector(1,7,5)
3-element MVector{3, Int64} with indices SOneTo(3):
 1
 7
 5

julia> incr2!(v)
3-element MVector{3, Int64} with indices SOneTo(3):
 1
 7
 7

julia> incr2!(v)
3-element MVector{3, Int64} with indices SOneTo(3):
 1
 7
 9

julia> incr2!(v)
3-element MVector{3, Int64} with indices SOneTo(3):
 1
 9
 1
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