43257...22951 (1286-digits)

This number is a prime.

(260708115+6*31232070)*3001#+1 is the 7th member of the largest seven known prime numbers which form an arithmetic progression of length 7 (as of 21 March 2003). The seven members are: (260708115+k*31232070)*3001#+1 with k=0...6. They have 1286 decimal digits each. Their common difference d is d=31232070*3001#. [Fougeron and Rosenthal]