10000...00000 (800-digits)

This number is a composite.

Call this number N and you get with N+1299258655252617+d the smallest 800-digit prime quintuplet to pattern d=0,4,6,10,12. For N+2117758391972791+d you get the 2nd smallest 800-digit prime quintuplet to pattern d=0,2,6,8,12. [Luhn]