12455...12591 (37-digits)

This number is a prime.

                                    1245592 7803718945 4675739665 0798812591

Minimum number of terms required in the Gregory-Leibniz Series, i.e., 4(1 - 1/3 + 1/5 - 1/7 +...), to obtain a value of π correct to 37 decimal digits. [Honaker]