a+b+c+d+1=5,16a+8b+4c+2d+1=15,81a+27b+9c+3d+1=34,256a+64b+16c+4d+1=65

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.