I took the index in the words, converted the number to binary, additional a few zeros, calculated the sha256 digest, took the main A part of the hexadecimal to convert it to binary, additional 3 zeros for the 8 digits on the binary and obtained 00000010011 which interprets to 19 https://wildbookmarks.com/story19021659/the-5-second-trick-for-ledger-seed-phrase-bip39