The 49 in the 49 + 1 sequence is a good example how Yahweh uses one number and
adds it together a number of times. Here, He adds the number 7, 7 times:
7+7+7+7+7+7+7 =49 days relating to the "Feast of Weeks". He also added
7+7+7+7+7+7+7 =49 years to celebrate the Jubilee.