Sample run:

$ python experiments.py 
Starting from the first ת every 50 letters in book Genesis:
5: תורה
Starting from the first ת every 50 letters in book Exodus:
7: תורה
Starting from the first י every 8 letters in book Leviticus:
1: יהוה
Starting from the first ה every 50 letters in book Numbers:
6: הםבל
Starting from the first ה every 50 letters in book Deuteronomy:
2: הברל
20 occurences of תורה found in the entire bible.
14 backward occurences of תורה found in the entire bible.