According to some online sources, if you take every 50th letter of the first two books of the Torah, you'll end up with a repetition of the word "Torah". And the same applies but backwards for the 4th and 5th books.
And the same counting in the 3rd book will give G-d's Name.
Is this true?
The effect was among many found by Rabbi Dov Weismandel (originally from Prague) in the 1950s in New York. It was his discoveries that motivated all the Torah Code stuff, but he made no claims about finding meaning from these patterns; at least not beyond finding them an indication of Divine Authorship.
Anyway, start with the "ת" at the end of the word "בראשית", so the first letter of the pattern is the 6th letter of the Torah. Now, skip ahead 49 letters to get to the "ו" of "תהום", then another 49 -- the "ר" of "וירא", and finally the "ה" of "א-להים". Similarly in Shemos, start with the first "ת", ie one in the title word, count ahead 49, etc... (That's intervals of 49, ie the 50th letter.) Bamidbar spells "הרות" (Torah backwords) and Vayiqra only shows the effect on the 49th letter (invervals of 48) and only when starting from a later "ה", in verse 5. As for Vayiqra, R' Weismandel found Hashem's name starting from the first "י" and counting 8s. And so on...
So, if we change "every 50th letter of the first two books of the Torah, you'll end up with a repetition of the word 'Torah'" to doing it once from the first "ת" in each book, the emended claim would be true.
The question as asked is not factually true. However, if you start from the first Taf, ת, and count fifty letters, then it does work out.
See:
This is factually untrue. You only need to get 50 letters into the first book of the Torah to discover the letter Lamed, ל, in Bereishit 1:2. Likewise in the book of Shemot, the 50th letter is a Shin, ש, in Shemot 1:2.
The 50th, 100th and 150th letters of the book of Vayikra are א, then ר and מ respectively.
Note that this answers the actual question, and does not address the patterns mentioned in the comments.
Whoever thought that one up really didn't think it through at all.
Rav Weismandel zl describes it here in his Sefer Toras Chemed תורת חמ"ד. I'm surprised nobody mentioned that towards the end of each ספר (besides ויקרא), it also spells תורה backwards, as described in the above ספר. His pupil Rav Ezriel Tauber zl used to tell over that later in Rav Weissmandel's life he discovered that also in the middle of ספר ויקרא, from the first י in פרשת קדושים, he found the שם הויה with a gap of 49 letters! The amazing thing is that he discovered all this long before the existence of computers!
As the 50th letter of B'reishit is a Lamed, ל, (which makes a 'L' sound) not a Taf, ת, {which makes a 'T' sound), I think that that can prove that this is not true.
