3, 11, 80, 291, 803 Find the odd man out of the number series?

The given number series is 3, 11, 80, 291, 803

$33 + 23 = 3 + 8 = 1111 + 43 = 11 + 64 = 75 (\mathrm{not} 80)75 + 63 = 75 + 216 = 291291 + 83 = 291 + 512 = 803$