import * as euler from 'euler.js'

function trunc_l(n) {
  if (n < 10) return undefined;
  return Number(euler.digitize(n).slice(1).join(''));
}

function trunc_r(n)
{
  if (n < 10) return undefined;
  var s = euler.digitize(n);
  return Number(s.slice(0,s.length-1).join(''));
}

var truncs = [];

outer: for (var i = 10; i < 1000000; i++) {
  if (euler.isprime(i)) {
    var r = i;
    while (r = trunc_r(r))
      if (!euler.isprime(r)) continue outer;
    var l = i;
    while (l = trunc_l(l))
      if (!euler.isprime(l)) continue outer;

    truncs.push(i);
  }
}

console.log(truncs);
console.log(truncs.reduce((a,v) => a += v));