53137619

This number is a prime.

{p, p+2}, {p*(p+1)*(p+2)-1, p*(p+1)*(p+2)+1} and {(p*(p+1)*(p+2)-1)*(p*(p+1)*(p+2))*(p*(p+1)*(p+2)+1)-1, p*(p+1)*(p+2)-1)*(p*(p+1)*(p+2))*(p*(p+1)*(p+2)+1)+1} are three sets of twin primes, where p is prime (smallest case p=53137619), i.e., {53137619, 53137621}, {150039737689461113590379, 150039737689461113590381} and {3377683004689157984087647873949586284258308039366835664408380129281619, 3377683004689157984087647873949586284258308039366835664408380129281621}. The sequence begins 53137619, 117770039, 167438669, 1319897399, 1522824599, 2107252919, 2160483929, ... . See PC3. [Bajpai]