For what it's worth, this is the only resource about numbers that I have...
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Number in Scripture
Its Supernatural Design and Spiritual Significance
ByE. W. Bullinger
(1837-1913)
Fourth Edition, Revised
London
Eyre & Spottiswoode (Bible Warehouse) Ltd.
33. Paternoster Row, E.C.
1921
This book is in the Public Domain.Copy Freely
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...THIRTEEN
This number has been considered in connection with the number eight, to which the reader is
referred (see pages 205-232)....
....But here we must consider the two numbers
EIGHT AND THIRTEEN TOGETHER
that we may afterwards compare and contrast the two. For this purpose we must consider the number thirteen here, and out of its otherwise proper order.
As to the significance of thirteen, all are aware that it has come down to us as a number of ill-omen. Many superstitions cluster around it, and various explanations are current concerning
them.
Unfortunately, those who go backwards to find a reason seldom go back far enough. The popular explanations do not, so far as we are aware, go further back than the Apostles. But we must go back to the first occurrence of the number thirteen in order to discover the key to its significance. It occurs first in Gen 14:4, where we read "Twelve years they served Chedorlaomer, and the thirteenth year they REBELLED."
Hence every occurrence of the number thirteen, and likewise of every multiple of it, stamps that with which it stands in connection with rebellion, apostasy, defection, corruption, disintegration, revolution, or some kindred idea. The second mention of thirteen is in connection with Ishmael, Gen 17:25. He was thirteen years old when Abraham circumcised him and admitted him into the covenant to which he was a stranger in heart, and which ended in his rebellion and rejection.
We see it stamped upon the very fore-front of Revelation. For while the opening statement of Gen 1:1 is composed of seven words and twenty-eight letters (4x7), the second verse consists of fourteen words, but fifty-two letters; fifty-two being 4x13 tells of some apostasy or rebellion which caused the ruin of which that verse speaks.
But it is when we come to
GEMATRIA
that the most wonderful results are seen. These results may be stated thus, briefly: That the names of the LORD's people are multiples of eight, while the names of those who apostatized, or rebelled, or who were in any sense His enemies, are multiples of thirteen. This statement, if it be proved, is one of the greatest evidences of verbal inspiration which the world has yet seen. The discovery of the great principle is due, we believe, to the late Dr. Milo Mahan, of New York, who has given many examples of it in his work already referred to, now long out of print. The effect of this law can hardly be estimated in establishing the presence of an ever-present working of the Holy Spirit in inditing the very words and even the letters of Scripture. No human foresight or arrangement could have secured such a result beforehand; no human powers could have carried it out in such perfection. No matter where we look, we find the working of the law without cessation, without a break, without a flaw from beginning to end. Only one conclusion is possible, and that is that the Bible has but one Author, an eternal, omniscient Author, designing, superintending, working, and carrying out His own infinite plans.