The tetralogue is equal to E1#4 = EEEE1 = 10101010 using Hyper-E notation. The term was coined by Sbiis Saibian. Username5243 calls this number goodcolduplex or dooquol, and it's equal to 10[2]4 = 10[1]10[1]10[1]10 in Username5243's Array Notation.