I took the index of the words, converted the amount to binary, included three zeros, calculated the sha256 digest, took the primary Element of the hexadecimal to transform it to binary, additional 3 zeros into the eight digits on the binary and received 00000010011 which translates to 19 in decimal. https://whitebookmarks.com/story18887109/ledger-seed-phrase-bip39-no-further-a-mystery