16674...60001 (111-digits)

This number is a prime.

                               1 6674490806 8958426716 5900875177 6385350270
3245089096 5184995545 3691538889 3759300329 3539166656 4679008085 3396160001

Just showing those entries submitted by 'Rupinski': (Click here to show all)

Let this prime be P. Then P, Q=2P-1, and R=4P-3 form the smallest Cunningham chain of length 3 (2nd kind) such that P mod N = Q mod N = R mod N = 1 for all N < 2^8. [Rupinski]