http://revach.net/article.php?id=2943

Section: Parshas HaShavua   Category: Numbers & Letters
Parshas Lech Licha: The Baal HaTurim Finds Yitzchok, Where Is Yishmael?
The Baal HaTurim says that "Lech Licha" is Gematria 100 (Lech = 50 Licha - 50), hinting that if Avrohom goes to Eretz Yisrael he will be zocheh to have Yitzchok at age 100.  However, we know that Avrohom had Yishmael at 86 years old, why is this omitted?

Rav Moshe Singer says that in the words "Lech Licha" there is a Remez for this as well.  It is brought down in the Seforim HaKedoshim that the Nekudos of a word also have a numeric value.  Each dot which is equivalent to a Yud is 10 and each line is 6.  The Nekudos of the words Lech Licha (Segol [30 + Shva [20] + Shva [20] + Kumatz [16] = 86).  Avrohom was 86 years old when Yishmael was born.