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function tripletSum(x, a) {
  
    found  = []
    copy = a.slice()
    loops = 0
    a.forEach((e, i) => {
      loops = i
      head = copy.shift()
      tail = copy
      
      tail.forEach((el, index) => {
        if ( typeof tail[index+1] != 'undefined') {
          console.log(`adding ${head} + (${tail[0]} + ${tail[index+1]}) = ` + parseInt(head +(tail[0] + tail[index + 1])))
          sum = head + (tail[0] + tail[index + 1]);
          if (sum == x) {
            found.push(head, tail[0], tail[index+1])
          }          
        } 
      })  
      
      // Insert head to end of tail
      if (loops !=a.length) {
        tail.push(head)
      }
      
    })
    
    if (found.length) {      
      console.log('Found: ', found)
      return true
    } else {
      return false
    }
}


tripletSum(1107, [174, 430, 405, 706, 627, 813, 376, 94, 566, 37, 737, 142, 815, 995, 257, 653, 937, 839, 483, 356, 16, 132, 231, 842, 626, 12, 638])


/*

[5, 2, 21, 8, 4, 9]

[5] + tail[0] + tail[1]  (2 + 21)
[5] + tail[0] + tail[3]  (2 + 8)

head goes to end
*/