drange

\documentclass[12pt]{article}
\usepackage{todonotes}

\makeatletter
\newcounter{todofootnote}
\renewcommand{\@todo}[2][]{%
  \if@todonotes@prependcaptionglobal%
  \@todonotes@prependcaptiontrue%
  \else%
  \@todonotes@prependcaptionfalse%

drange

from datetime import datetime

def sieve(n):
    lst = [True]*n
    for i in range(2,n):
        if lst[i]:
            for j in range(i+i,n,i):
                lst[j] = False
    return lst