'Fifty one' in the Bible

All that were numbered of the camp of Reuben were a hundred and fifty-one thousand four hundred and fifty, according to their hosts. And they shall set forth second.

And at the last Asa fell on sleep with his fathers and died when he had reigned fifty one years.

And thence, the brothers hearing of us came out to meet us even to the Forum of Appius, and the Three Taverns [fifty-one miles]; and when Paul saw them, thanking God he took courage.