I took the index with the words, converted the range to binary, extra a few zeros, calculated the sha256 digest, took the 1st Element of the hexadecimal to transform it to binary, added a few zeros for the eight digits in the binary and acquired 00000010011 which translates to 19 https://isocialfans.com/story4381932/ledger-seed-phrase-bip39-no-further-a-mystery