Initial data commit

Task/Unprimeable-numbers/JavaScript/unprimeable-numbers-1.js

@@ -0,0 +1,10 @@
+Number.prototype.isPrime = function() {
+  let i = 2, num = this;
+  if (num == 0 || num == 1) return false;
+  if (num == 2) return true;
+  while (i <= Math.ceil(Math.sqrt(num))) {
+    if (num % i == 0) return false;
+    i++;
+  }
+  return true;
+}

Task/Unprimeable-numbers/JavaScript/unprimeable-numbers-2.js

@@ -0,0 +1,13 @@
+function isUnprimable(num) {
+  if (num < 100 || num.isPrime()) return false;
+  let arr = num.toString().split('');
+  for (let x = 0; x < arr.length; x++) {
+    let lft = arr.slice(0, x),
+        rgt = arr.slice(x + 1);
+    for (let y = 0; y < 10; y++) {
+      let test = lft.join('') + y.toString() + rgt.join('');
+      if (parseInt(test).isPrime()) return false;
+    }
+  }
+  return true;
+}

Task/Unprimeable-numbers/JavaScript/unprimeable-numbers-3.js

@@ -0,0 +1,29 @@
+let unprimeables = [],
+    endings = new Array(10).fill('-'),
+    c = 1;
+function chkEnds(n) {
+  let e = n % 10;
+  if (endings[e] == '-') endings[e] = n;
+}
+console.time('I');
+while (unprimeables.length < 1000) {
+  if (isUnprimable(c)) {
+    unprimeables.push(c);
+    chkEnds(c)
+  }
+  c++;
+}
+console.log('The first 35 unprimeables:');
+console.log(unprimeables.slice(0,35).join(', '));
+console.log(`The 600th unprimeable: ${unprimeables[599].toLocaleString('en')}`);
+console.log(`The 1000th unprimable: ${unprimeables[999].toLocaleString('en')}`);
+console.timeEnd('I');
+console.time('II');
+while (endings.includes('-')) {
+  c++;
+  if (isUnprimable(c)) chkEnds(c);
+}
+for (c = 0; c < endings.length; c++) {
+  console.log(`First unprimeable ending with ${c}: ${endings[c].toLocaleString('en')}`);
+}
+console.timeEnd('II');