I took the index in the words, transformed the quantity to binary, added three zeros, calculated the sha256 digest, took the 1st Portion of the hexadecimal to transform it to binary, additional three zeros into the 8 digits with the binary and got 00000010011 which interprets to 19 in decimal. https://brightbookmarks.com/story19673468/5-essential-elements-for-bip39-explained