I took the index with the words, converted the variety to binary, included 3 zeros, calculated the sha256 digest, took the first Section of the hexadecimal to transform it to binary, additional 3 zeros towards the eight digits of the binary and bought 00000010011 which translates to 19 in decimal. https://privatebookmark.com/story19170407/ledger-seed-phrase-bip39-no-further-a-mystery