Here is one from a letter he wrote:
or a sense of the exacting, yet completely bizarre flavor of Newton’s prophetic calculations, see another Newton letter at the of the post, transcribed below.
Prop. 1. The 2300 prophetick days did not commence before the rise of the little horn of the He Goat.
2 Those day [sic] did not commence a[f]ter the destruction of Jerusalem & ye Temple by the Romans A.[D.] 70.
3 The time times & half a time did not commence before the year 800 in wch the Popes supremacy commenced
4 They did not commence after the re[ig]ne of Gregory the 7th. 1084
5 The 1290 days did not commence b[e]fore the year 842.
6 They did not commence after the reigne of Pope Greg. 7th. 1084
7 The diffence [sic] between the 1290 & 1335 days are a parts of the seven weeks.
Therefore the 2300 years do not end before ye year 2132 nor after 2370.
The time times & half time do n[o]t end before 2060 nor after [2344]
The 1290 days do not begin [this should read: end] before 2090 [Newton might mean: 2132] nor after 1374 [sic; Newton probably means 2374]
Doesn’t seem that bizarre if you’ve read much prophetic theorizing. Par for the course, I’d say.