10000...18649 (10000-digits)

This number is a probable-prime (likely to be a prime but we have not (re-)proven it on this site).

A search at "Database Query" in November 2022 for “twin” would reveal an odd number of 643 twin primes. How can this be if twins occur in multiples of 2? It seems to be because 10^9999+2421018651 was recorded in June 2021 while the smaller twin of 10^9999+2421018649 was lost in the shuffle!? This smallest gigantic twin of 10^9999+2421018649 was rediscovered in November 2022 by somebody else while combing through the database and then proved with the Integer Factorization Calculator (Alpertron). [Stath]