I took the index on the words, converted the range to binary, added 3 zeros, calculated the sha256 digest, took the first Component of the hexadecimal to transform it to binary, added 3 zeros to the 8 digits with the binary and acquired 00000010011 which translates to 19 in decimal. https://userbookmark.com/story18987407/a-secret-weapon-for-bip39-words-to-numbers