I took the index in the words, transformed the quantity to binary, additional three zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to transform it to binary, added a few zeros towards the 8 digits of the binary and got 00000010011 which interprets to 19 in https://hubwebsites.com/story20117452/the-5-second-trick-for-ledger-seed-phrase-bip39